She'll remain hopeful forever. Alduin could destroy the entire world and she'd be waiting there for you to come back. For your approval. To validate that her choices in life weren't wrong. That joining the circle herself wasn't the biggest mistake she ever made. That she could've got out like you did.
Are you going to continue to make her suffer like that?
Wow. That's about the saddest thing I've ever read.

...
...
But yep, it looks like I'm just going to leave her there.
Man that really ... svcks. Honestly most of my characters, if I really role-played them to character, would refuse this offer. I only say yes to move the quests along. But I'm determined to not do that on my next role-play ... so I guess ... dang that just really svcks.
Now I wonder if we will be forced to be a vamp at some point in Dawnguard just so Bethesda can force us to check out their new gimmick. Man I hope not.