don,t know what to do

I am disabled and my daughter and her 2 boys live with me.  She won't co-operate with chidsupport enforcment so she can't get mediical coverage for herself or get child care for the boys.  She just got a job and I told her that I am not supposed to be taking care of the boys because of ssi and because it takes so much out of me and I hurt so bad already.  And she also leaves after the boys are asleep and doesn't come home until 1 or 2 in the morning and it seems like the baby knows shes gone and wakes up eveery time she leaves. 
I feel like running away.  She has only lived on her own once for a month and she got evected for drugs.  She has lived basicaly off of other people and being kicked out of places and getting fired from her jobs. She is so mean to the four year old that I am surprised the she still has him and the baby thinks I am momma.
I want to leave next month.