AIO Roommate wants me to cover more than my share of rent
Yesterday my (25M) roommate (25F) asked me about my income. I recently started a better paying job and she asked what my paychecks were looking like. I told her my hourly pay, then added that because I work less than 40h a week my paychecks are smaller than you would think, telling her that number as well.
When I asked her why, she said she was thinking about asking me to take on more of the rent, since I make more than her, saying she is struggling with money right now, but after hearing what my paychecks are, she won't ask that of me.
I said that I was sorry to hear she is struggling right now, but even if I was receiving larger checks I would likely not do that for her, as we started renting together splitting everything 50/50. She said that she pays more because she pays the pet rent. And she's "bleeding money" right now. I said that I have plenty of debts, medical and school related, which she doesn't have.
We dropped the conversation after that, but it's been kinda bothering me. She pays the pet rent because they're her cats. I pay for half of their litter, food, and I even paid the groomer because one of her cats sheds really bad and was making my allergies act up. We split all the groceries 50/50 too.
I suppose I'm just frustrated she would ask me to take on more of the rent when she could easily reach out to her parents for help. They paid off her credit card debt the last time she was in pretty deep and struggling, and they are very willing to front her money for things she needs but can't afford at the time. I'm financially independent from my parents as we don't have a good relationship, and don't have the luxury of having someone else pay off my debts.
Am I justified in my frustration with her bringing this up? I don't want to restart the discussion because I'd rather not cause an argument, especially since she didn't actually make that request of me. I've just been going over the conversation in my mind, unable to drop it and building up frustration.
Edit: thanks for the advice and affirmation everyone! Because some folks have asked: my roommate is my best friend and she is the closest thing to family I have. That's why I talk with her about finances, we are very close and discuss most things. I do not mind helping her out, as she has been there for me at points in my life where I needed help. I apologize for not clarifying that before, I did not intended to misled, I just forgot most people aren't close with their roommates.
Many of you say I should not be paying for the cats litter/food. I do agree somewhat, but she also pays for half of the expensive protein shakes I get from the grocery store. I find it simpler to just split every grocery run 50/50 rather than trying to itemize the lists to who owes what.
Thanks again everyone, I appreciate the outside perspective and I can let this rest more easily now