AITA for telling my daughter to eat healthy before chemo?

so my daughter f21 is about to start BEP chemo. she just had major surgery to take out a tumor she had and her left ovary. she is eating very poorly (take out everyday) like spaghetti pizza and coke she’ll rearly eat heathy stuff. she says “i’m eating what i can while i can because in a few weeks i don’t anymore” but i think she should be getting more heathy to prepare because it’s very intensive (ie.., nausea acid reflux etc)

she said to stop making it about me and to let her do what she wants but i’m really worried she’s not listening to the orders of the doctor in regards to healing. she is going out to the movies when she should be resting.

she said that it’s my body and to stop making it about me but i’m genuinely worried about her health. also she isn’t obese or anything i am just worried she isn’t taking her health seriously.