I am in COMPLETE shock!!

My mom offered me money if I would let her see my daughter.  She knows that I'm going through Dave Ramsey's finance program, and she knows that the first step is to get $1000 in savings for an emergency fund.  She offered me $150 a month if I would let my daughter go to her house on my drill weekends.  I'm kind of in shock, as I've NEVER heard of anyone offering money for a child.  I don't know what to do!!!  Of course, I said absolutely not to my mom, but is there something else I should do?  I mean, I don't know if it's legal or not, but it's DEFINITELY not moral.  In the same exact email she asked me where her Christian daughter has gone.  There has been so much emotional/mental/verbal abuse in my life, that I'm finally starting to recognize it when I see it.  My mom thinks she can manipulate me into feeling sorry for her, by attacking my character, trying to make me doubt myself.  She thinks that if she is mean enough, eventually I will feel bad enough about myself that, in order to make the abuse stop, I will come around to her way of thinking.  Not gonna happen this time.  I've had enough.