I (25,F) don't speak to my mother, like at all. I had to go to my mothers house today to pick up an important document that I left behind when I moved out seven years ago

As soon as I got to the house, my mother suddenly had a massive emergency and realised that it was apparently her friends funeral today and she completely forgot about it I couldn't help but internally roll my eyes, as there is always some drama hence why I have gone no/very low contact

She asked me if i would watch my two younger brother (7 and 11) whilst she went to the funeral, and i said absolutely not, as its my only day off, i have plans, and i have no relationship with them due to my mother stopping them from seeing me for years i just wanted to get my birth certificate and leave. my mother asked her friend if she would babysit and asked me to stay for 10 mins untill her friend came. I didn't even get the opportunity to say no before my mother left the house. I was seething but resolved to wait 10 mins. My mothers friend turned up and started berating me for not agreeing to look after my brothers whilst my mother went to the funeral

I said i dont have anything to do with my mother, its my day off work, and im under n obligation t lokk after anyone else's children . My mothers friend then told me to go to my room. I laughed in her face and started to leave the house, at my apartment, that I pay for with my big girl job. because I'm an adult, not a child. And don't ever speak down to me like that again. And I left My mother has left me loads of messages and missed calls saying I'm an AH for the way I spoke to her friend I do admit I look kind of young but I still am not happy with the way my mothers friend spoke to me. AITA?