Treacle, if you really have nowhere else to live this is what I'd do.
I'd leave for work in the morning with a few extras and book into a hotel for a night or two without telling your mother where you are.
Let her stew and give her no information when you return.
Do it again when you can afford it...and again.
I'm not telling you to do that as I don't know your circumstances. I am telling you what I would do. If nothing else came of it I would enjoy the peace and quiet.
Only you know if that would make her worse, though I can't see how she can be any worse from what you tell us.