Book help please?

I read it a while back and I thought I had it in my kindle, but I don't. It is about a girl who doesn't have a great family. She does everything for them (giving them her hard earned money). She meets a rich lady (her boss) who tries to help, but the girl is too embarrassed to accept it.

Later find out, she is living in the attic of her job where her boss works. Her boss takes her to her place. The girl is a "little" and the boss becomes a mommy to her. Her boyfriend, becomes the daddy. The other guy is the uncle (friend to them both). I have more details if it could help. I believe there are 2 books to it. I have been trying to find it now for over a week. If you could help, it would be greatly appreciated