I'm with Jem on it depending what the felony was. I would marry a pirate, but I wouldn't marry a murderer.
... or a sexual convict.
Perhaps she is afraid of moving back in with her parents because they are bound to scowl her for all her irresponsible choices, and it's easier to run away from that, than to face it head on.
I'm sure that she realizes that living in a tent whilst being pregnant isn't the smartest thing she could have possible done, but if she feels like she has no other choice... then my guess is that she feels she is trying her hardest to provide a -fairly- secure spot for herself and her baby.. I mean, it's better than sleeping under today's newspaper in the park.
Nevertheless, I think her parents need to seek out professional help to force her to come back. She's a danger to her own health, and to that of her unborn child. And as she's clearly not able to make the rational choice, I think her parents should do it. Not so much for her, but for her baby.
Did the program give any details as to why her husband lost his job? Did it have anything to do with him having been convicted?