Misty tells her mom that they can give her probation for ten years, she doesn't care. Mom said "you've got to find a place to live sis".
At the very least Lisa could have said, "Well, you can stay with us until you get on your feet." Let's face it Misty isn't getting out for a looooong time, and even though I know how most of you feel about her, as her mother, I would want to comfort her and give her hope that when she gets out, she will have a place to go.