I feel like my gf is pressuring me to eat unhealthy

I’ve (f17) been with my girlfriend (f20) for 5 months. I’m very strict with what I eat because I struggle to maintain my weight otherwise (I’m 5’4 and 97lbs). There’re many foods I haven’t eaten in a long time, like fast food, cookies, ice cream and anything with sugar. My girlfriend knows this, she’s known from the beginning. But she keeps pressuring me to eat things I don’t want to.
Every time she orders food she asks me lots of times if I want something. When she eats cookies or other things she knows I can’t eat, she keeps insisting on me trying them. When we went to the cinema she wanted to buy me something to eat and kept insisting after I told her I don’t want to. She wants me to try the things she bakes while knowing I don’t consume sugar. She doesn’t make an effort to try to cook things I can actually eat.
I don’t judge her for what she eats because despite not eating well she has a good body.
I like her very much, but all the time I feel like she doesn’t care about my diet. I don’t want to be with someone who doesn’t support my goals, and instead she’s making it harder for me to eat healthy. I don’t know what I should do?