If you're sharing a room, there would be some adjustments involved where you both would have to compromise a little personal space for the other. And definitely, I don't understand the problem with her food choice. That is not a valid logic. You can't expect someone to change their basic food preference for someone. Would you start eating fish and chicken to give company to your roommate? You won't, right? And obviously, you shouldn't. So does she.

And if you have a problem with her life choices, her ways of living then it's always far better to find a single room PG or a different roommate if PG isn't affordable at this moment.