It occurs to you that you could try to contact Briar's mother from Sunnydale, but you quickly dismiss the idea. Briar's continued presence here implies that there are no permanent portals to Faerie or Hyrule in the area, which means the barriers between those dimensions and this one are not that much weaker here than they are anywhere else. Your own reincarnation is no great indicator to the contrary; souls are quite good at slipping between dimensions, which they normally do in order to reach the various "afterlives." And while you could still try to brute-force a connection to the Great Faerie in question, the presence of the Hellmouth means you're at least an order of magnitude more likely to accidentally get in touch with something that isn't Briar's mother. If that were to happen, it's pretty much guaranteed not to end well. As for waiting to make a trip to the former site of the portal, well, considering your family's financial position, it could easily end up taking a year or two before you could afford something like that - and if you're going to wait that long, you might as well spend the time figuring out how to fly, teleport, or summon/conjure something that could help you make the journey.
"We'll have to put that one down as a long-term project," you finally say. "Sorry, Briar."
"It's find, Alex. I've still got a few years before Mom'll start to worry, and it's not so bad here now that I've got people to talk to."
"Still," you say, "I will get you home eventually. I promise."
Priority Established! Mission: Interdimensional Postman is a go!
Your insistent oath is followed by an awkwardly heartwarming silence.
"So, um, not to completely change the topic," you say then, "but I noticed something weird when you were talking about what happened in Hyrule."
Briar gives you a curious look, and you elaborate. As best you're able to tell, everything she described really happened, but so did a bunch of other things. The Twilight Invasion. The awakening of Vaati. The flooding and ultimate destruction of the Old Kingdom. The discovery and founding of the New Kingdom. The more you talk, the more you become certain that your memories don't just span multiple lifetimes, but multiple realities - multiple timelines, three of them, all of which go back to a single common incident: the first confrontation between Ganondorf and Hyrule.
In the timeline Briar hails from, Ganondorf overthrew the Hylian monarchy, slew the Hero of Time, and seized the complete Triforce, only to be sealed into the Sacred Realm by Zelda and the Sages - and you'd really like to know how exactly they managed to pull that off, when Ganondorf had an omnipotent wishgranting divine relic fused into his hand. You're wary of probing too deeply, however, as it might stir up more memories.
In another timeline, Ganondorf's attempted coup failed. He never saw the Hero, save for a single fleeting glimpse of a child in green with a fairy hovering at his shoulder, and they certainly never fought; instead, the weak, overly-trusting king and clumsy soldiers who'd fallen so neatly into Ganondorf's trap in the previous world somehow turned his scheme back on him, launching a counter-offensive that had landed the Thief-King in prison and effectively ended the Gerudo as a military threat. Not long afterwards, the Seven Sages attempted to execute Ganondorf, only to be thwarted by a seemingly divine providence that granted him possession of the Triforce of Power, and thereby immortality. You're no more certain how that happened than you are of how the previous timeline's Sages managed to seal an omnipotent Ganondorf.
Finally, there was the timeline where Ganondorf was defeated by the Hero directly, and cast into the Sacred Realm by the Sages immediately thereafter. When he finally re-emerged, no Hero appeared to stand in his way, and Ganondorf successfully conquered all of Hyrule - only for the gods to intervene directly and flood the entire really have to take a few minutes to stop and reflect upon that act, and its implications. You're not sure if it means Hyrule's gods are more active, more powerful, or simply more obvious than the various divine, infernal, or merely absurdly powerful entities that claim Earth as their dominion, and to be honest, you're not sure which prospect scares you more. On the one hand, Earth's gods don't go around personally smiting evil, and a lot of major villains - starting with crooked politicians, working up to serial killers, and finally reaching kiloNazi levels - are able to get away with their personal misdeeds for a long time before they finally get reined in. On the other hand, Hyrule's gods destroyed an entire kingdom overnight, just to contain one man.
You're torn between being flattered and being flat-out terrified.
Briar surprises you by accepting your story without a hint of disbelief.
"There are creatures in Faerie that have... interesting perspectives on Time," she explains. "I've never spoken to one of them myself, but everybody knows that they've been keeping an eye on Hyrule since the era of the Hero of Time, if not longer. A divergent timeline would definitely explain why." The fairy frowns. "I can't explain why you'd be remembering the life of Ganondorf in all three timelines, though. If we were in Hyrule and you were anyone else's reincarnation, I'd suggest that you look up a priest and try to get a straight answer from the gods. As it stands... I got nothing."
You're drawing something of a blank yourself.
OOC: Quick note - Priorities are long-term goals that take up some of your time and effort (effectively reducing your available actions by 1) until they are completed or you give up. There is no penalty for not making a course of action a Priority when it's offered, since depending on your actions, you may end up finding the solution to the Priority anyway. On the other hand, accepting a Priority and then abandoning it does carry penalties. So why bother setting Priorities at all? For one thing, focused effort is more likely to yield solutions, and sooner, than general activity. For another, successful resolution of a Priority earns bonuses. And for a third, some of these matters - like the memory-dissonance issue - can be potentially dangerous if not dealt with promptly.