Tricky situation with mom. Advice needed

So my mom's husband just told her he wants a divorce. My mom has been staying with her parents. She tried to stay with my sister but it didn't work out and I am too far from her therapies. She can't stay here anyway though because it would cause way too much drama in my house. She would want to watch my son instead of daycare but she is too mentally unstable in my opinion. My husband also doesn't care for her. So anyway, she doesn't have a job, and doesn't have any money. She refuses to get a job too because she says no one will hire her. How can I support her through this situation without causing chaos in my own life? We don't get along very well but she really has no one.