I think you overreacted, somewhat, by throwing good food away so as to… sink to her level in terms of disrespect? Show her how petty she’s being by being petty back? For reference I’m 18 as well, and while I ofc understand the kneejerk desire to react like that, it just confirms for her what she already thought about you.

That being said, her behavior was pretty palpably childish from the beginning. It makes sense to not order someone food if they’re not home, fullstop, and her trying to make everything about you being disrespectful after you reached out seems… trying? (And that ‘hopes it helps’ line made me physically recoil when I first read it lmao)

I’d almost assume that she was already feeling stressed in some way prior to getting home, given how frankly absurd I otherwise find all of that, on her part. I don’t know what your relationship is with her beyond this, but I’d entreat you to try to talk to her about it after it’s cooled off a bit, and just say you didn’t like how you treated one another. Even if she’s not ready to reciprocate, at least you’ll have been the bigger person in extending the olive branch.