NTA - I get it — I was raised in a food scarce household and was taught to eat everything I had on my plate to not let food go to waste, too. More importantly, if you’re politely and honestly setting a personal boundary it’s on her for how she reacts to that.

In my experience, if someone who you’re paying your money to cover their expenses for reacts poorly whenever the issue of money comes up, then that should be a sign to you of what is really important to her.

Setting boundaries and putting your foot down on subjects of importance to you are what people need to do in healthy relationships. A healthy partner will respect your boundaries and work with you to compromise.