You need to look out for yourself. If you can start therapy. There's been a lot of damage that may or may not be able to be repair. She doesn't seem "over" the pain and is lashing out at you. This does not excuse her abuse of you. If you are not going to AA have her go to alanon. You can't force her to therapy. Just as much as no one can or should force medication on you. She may actually resent you for mentioning it because she may see it as all your fault. She may warm up to visiting yours from time to time.

Here's some steps you can take to make a better situation:
Try not to argue because your son doesn't need that.
Ask her to try alanon
look into HUD (section 8 & public housing)
Look into SSI
Get yourself a good therapist

Since your on the computer stop here.