No wonder she feels old for her age. That's a lot to be tied down to with no end in sight. The only way she could lighten the load or change anything was with you. The house is just geography, not an actual change. She is trying to figure out how to get a break and have something for herself. It must have been so hard on her to care for such a handicapped child and a baby too. No wonder she craves some kind of excitement. Even if it's just the excitement of not being in a relationship where she probably feels she has to give time to that too.

Does this handicapped child ever go someplace else so she can get a total break? Just having someone else share in the care giving isn't enough.