There aren't busses everywhere... perhaps there are where she lives, perhaps not, I don't know.. but there are a LOT of places where public transportation does not exist.
Really, here is a bus schedule for her, I am sure the $15 monthly pass is cheaper than gas for her.
http://www.colliergov.net/transadmin/atm/operations/cat/index.htm
I find it hard to believe that in the blue hair capital of the world, there wouldn't be good public transportaion or lots of opportunities to make very good money in nursing. When a woman makes 10 babies and chooses to not be with the father, then she better do all she can to provide for them.