If it was me, I'd just jump on her next time she started in on me. That's hard to do if you're not used to being assertive, though.
If you're looking to confront her now, starting with the cat thing is fine, since it is a recent example and she can't claim that she has no idea what you're on about and you're just imagining things.
Whether you address her in person or by email, you'll have to be prepared for a comeback--email just gives her the option of ignoring you. The good news is, assertiveness gets easier with practice.
I've found sarcasm to be a useful tool for dealing with people who are obnoxious like this. "Oh, Sally, thanks so much for be so concerned about my cat! I checked with my vet and she said Roo was fine the way she was, but it was nice of you to worry!"
Long-term, you may want to think about living somewhere else next year; moving sucks, but it's short-term suckiness, which IMO is preferable to the long-term suckiness of living with somebody you don't get along with. Grad school's hard enough without a bitchy flatmate.
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If you're looking to confront her now, starting with the cat thing is fine, since it is a recent example and she can't claim that she has no idea what you're on about and you're just imagining things.
Whether you address her in person or by email, you'll have to be prepared for a comeback--email just gives her the option of ignoring you. The good news is, assertiveness gets easier with practice.
I've found sarcasm to be a useful tool for dealing with people who are obnoxious like this. "Oh, Sally, thanks so much for be so concerned about my cat! I checked with my vet and she said Roo was fine the way she was, but it was nice of you to worry!"
Long-term, you may want to think about living somewhere else next year; moving sucks, but it's short-term suckiness, which IMO is preferable to the long-term suckiness of living with somebody you don't get along with. Grad school's hard enough without a bitchy flatmate.