Oh I have to agree that you were right to not do as asked given the circumstances. For one thing, your domme was not in a fit state to give you orders. I even wonder if she will realise that when you see her next and know she overstepped the mark.
It is also up to the sub to tell their Dom/me if they feel safe doing a task, which is exactly what you did. Don't let her make you feel guilty, as you did nothing wrong.
I hope next time you meet your Domme you are able to talk about what happened calmly and without her insisting you need to be punished.
Good luck
AG