I saw this on a tv show the other day. She has a website where people can pay to watch her eat or a paypal I think for people to donate money. That's how she keeps it going.
Where could she possibly work? In addition, she could possibly be on welfare and get money for the two kids as well. Hasn't been mentioned, but I wouldn't rule it out.
I have a feeling that her fiancee' is also her financier.