I have had girls phone me before thinking I'm part of an agency or something, I always tell them straight.
It sounds a bit werid, if she has a child and now she is saying that she will be on the streets?? What a dangerous thing to consider, regardless of whether you have a child at home.
I shared a flat with a girl last year, claimed she was new to the industry etc, me and my friend helped her, gave her clothes, condoms a room etc, even set her up on aw- after feeling a bit suspicious we decided to dig a bit deeper and to our surprise (not really) found a profile of her 40 miles away with plenty of feedback. Left us wondering why someone would do that!
If you really want to help her, maybe give her done agency names & numbers and let her start from there?
If it was me I don't think I would want to get involved.