Do you think I should refuse to go into my girlfriend's kitchen?
Why do you not want to go into your girlfriend's kitchen?
I would rather not eat her food
If you are over your girlfriends home she is going to know if you dont try her food. In this case, you need to at least try it and be honest with her on whether you like it or not. Refusing to try it is even worse than not liking it.
I can't risk it and throw up in her kitchen.
In that case, you really should tell her what kind of food you prefer. You want to enjoy something she cooks for you right? If she knows what you like, then she'll likely make that instead.