The timeline was destroyed.

The trio didn't escape via Dragon, didn't alert the Dark Lord to their break-in, and didn't rush to Hogwarts to find the diadem.

Her letter had pushed things ahead a month and, in doing so, had ruined any knowledge she had of the Final Battle.

Up until then she had carefully gaurded her "Seer' knowledge, aware that some secrets weren't hers to share.

But, desperate times...

"I need you to transform into an owl."

'Why?" Theo questioned.

"You can fly into Hogwarts with the morning post, and get to Snape."

"...what?!"