Need some advice

So me and my husband wanted to help one of my friends out. She was graduating collage, therefore losing student housing. So we decided to let her stay with us temporarily. She knew going into it that we are having a baby, and the baby is due in December. Since living here since August, she has had a job for 2 days and that's it. The whole idea was that we would not charge her rent so she could save up enough money to move out sooner. At this point we feel like we are just being taken advantage of for a free place to stay. And with the baby soon arriving, its stressing me out that she is further away from moving out then she was when she moved in. I don't know how to bring up the subject that she needs to move out. (The room shes staying in had already started becoming the nursery when she moved in)