To expect DD16 to be kinder

[IsItUs]

DD16 asked me to go with her to local supermarket as she wanted various things - conditioner, ice tea, etc.
Walked there and, as usual, I ended up carrying most of it back although DD reluctantly carried a few of her bits.
Somehow on the walk back along a main road I fell on the uneven pavement landing face down. I laid there quite winded, to hear DD shriek "why did you fall over". Rolled onto my side slowly and a man had jumped out of his car and helped me up. As I got to my feet, DD is holding out my (heavy'ish) bags for me which I took.
Thanked the man and headed off with DD again, turning into an alley to home after a few metres where I burst into tears. Not badly hurt - knees and hands cut and bruised, and shoulder jarred, but I think I was shocked and embarrassed. DD says in a hostile tone "what are you crying for!?" I told her to just leave me alone and she shouted "you're fucking mental" and stormed off home without me.
Not a word to me since. I made myself a cup of tea but I just feel really tearful. It's the latest in a line of cold hurtful behaviour and I do so much for her. I think this has made me realise how cold to me she is.
Am I unreasonable to expect a little concern from a 16 yr old. That she might have carried my 2 bags, made me a cup of tea or asked if I was ok? Or is this normal for a 16 yr old?
I'm sorry this sounds trivial, I don't know why I'm so upset.

@Nuttyroche she hasn't - is this meant for another post. She's never had a detention in her life, and she never messes about at school. She's a pain at home to me though!

I think @Nuttyroche got confused, there’s another thread at the moment where the dd missed a detention to go bowling which resulted in a Saturday morning detention so she’d miss a party at a theme park and she was being arsey because the mum op wouldn’t bail her out.

this too will pass.

you’re (both ops) doing brilliantly

If she has ADHD then it can be difficult to regulate her own emotions while perhaps feeling some sort of internal pressure to help you with yours. Demand avoidance comes in all sorts of flavours and this could be an expression of that, plus teenagers are arseholes.