EDIT:

I'm sorry I haven't replied to many of you, I went to sleep and then had a talk with my fiancé, I really didn't expect this to blow up!

A few of you are suggesting she was being selfish and that I should leave her. My family were actually suggesting the same thing, but I didn't want to be rash, I do love her.

Anyway, my family and I had a meeting with her and her family. It seems like there was a lot of misunderstanding on both sides. The book I gave her on vampire traditions kind of glossed over EVERYTHING, just giving basic descriptions without any detail. We had a proper discussion about her fears and worries, as well as vampire traditions.

She was worried about losing friends, not being able to eat garlic, and being awake at night (turns out she's scared of the dark, how cute!) My family have reservations about letting the marriage go forward, my family is strict on culture and tradition.

I managed to convince them that I love my fiancé too much, and said I'd rather become human for her than lose her, so we decided that, since I had worked really hard to live her family's lifestyle, in the few months leading up to the wedding she'll live mine and we'll see how she feels about living like a vampire.

Let's see how this goes. Wish me luck! (Oh, and to those who suggested I ditch her... don't leave your house at night...)