This is my take on how Sylvanas's necklace got to the Windrunner Spire since she didn't die there. Yes I purposefully gave the ranger no name.
Running. She had to keep running. No matter how much her legs ached, how labored her breath became, no matter how cold, and drenched she was from the rain, she had to keep running. The scourge was not far behind.
She cursed herself; she was weak, a coward. She was a ranger, and rangers were supposed to be courageous. They weren't supposed to run. The Ranger-General would be disgusted, no. Slyvanas was dead, her body burned with the rest of the capital city.
An abomination roar snapped her out of her daze. She was so tired, she could not breathe, her muscles gave out.
Suddenly she tripped, landing on the cold, unforgiving ground. It was over, death was moving in.
Looking up from the soil, she spotted something. In the clearing, where both moons shown, something twinkled. She grabbed it, and brushed mud off it. A necklace; brilliantly blue with fine silver delicately wrapped around the sapphire in such a way, that it looked as if it was crafted by angels. It had a slight crack in it, but other whys it was perfect.
Turning it over she read an inscription on the back:
To Sylvanas, Love always, Alleria.
This was Sylvanas's necklace! The very one Alleria Windrunner gave to her before she left for Draenor!
She had to protect it, she felt it in her gut. She got up, and ran faster. Her muscles screamed, but she didn't listen. She ran until she came upon a familiar place. Windrunner Village; her birth place.
She was forced to retreat, as scourge came pouring out of the abandoned homes. She ran up to the famous Windrunner Spire.
The spire was abandoned, but destroyed. Even if the furniture was broken, the walls scarred with the horrors of death, it was still shelter.
This safety did not last. She fell to the ground in agony as a horrible screech burned the midnight sky. A banshee flew in, her face twisted in agony, and rage.
She tried to grab her dagger, to kill the banshee. It was a blur, the banshee grabbed her, and with one swipe, stole her life from her. Her eyes closed shut for what she thought was the last time.
No, it wasn't. She roamed those halls as a monster for years, not one living soul ever came. All the time she spent there, she always kept the lady's necklace. Never letting it out of her sight.
One day was different, an elf came. At least she thought it was. It was a blur, all she saw was fel green eyes. The elf screamed something in Thalassian.
"I shall end your suffering, banshee!"
How dare this insolent elf call her a banshee! She had a name once! The elf attacked, and so did she.
Fate however, wasn't on her side. The elf struck her with an arrow, and she flew back. With horror, she watched the necklace she so dearly protected fly off her, right in front of the elf.
With her last breathes breathed; The nameless banshee, once a ranger, wondered what would become of the lady's necklace.
