I'm struggling right now

I have depression, my mom knows, I was recently diagnosed, but she didn't change the way she treats me at all. Anyway. She asked me to wash the dishes since yesterday or the day before. I didn't. Because I can't. I don't have the power to. She doesn't care though. Both my parents have always been like that. I don't know how to tell her I can't do the dishes and that I want to ask her if she could do them. I almost never before have asked her to do anything for me and I'm unsure how to make her understand.
Can someone please help?