What Would You Say

So I finished reading "The Nanny Diaries" tonight. It wasn't that great; it drove me nuts that the heroine is named "Nanny" (although often times she is called Nan; still obnoxious) and she works for the "X" family. Mr. X is a total womanizer, Mrs. X is so caught up in her own world that she doesn't even fathom what she is doing to Nanny, and Nanny only stays in this masochistic situation for Grayer, the little boy caught in the middle. What kills me is that Nanny would like to have a life outside of the X family, but she is so preoccupied with the X family's crap that all she can talk about is how poorly she is being treated. When I'm reading, I just want to know how it ends. Sometimes I'll think about what things mean or how to apply them to my life or compare them with other things I have studied, but when I'm done I like to think about the book. Now that I'm in reflection mode, I see a bit too much of myself and my situation with the neighbors in it. I can't claim to be in nearly as bad a way as Nanny, and they certainly aren't as rich and cruel as the Xes. Even so, I have very much appreciated having my own life for the past two weeks while she has been gone. I honestly don't mind watching their child; I just don't want to deal with the mom's crap. We won't be living here forever (or even for much longer, with any luck!), and I know I can't save the poor girl who is so starved for attention that she'll cry for hours in the middle of the night. Earlier this week, I also found out that (before we moved in) they would go to some other neighbors and just drop off their kid--they would show up unannounced, with the girl and a diaper bag, leaving their car running in the driveway, and say, "can you watch her right now?" They would do this to a woman with six children of her own! This is not something I can fix by babysitting for a few hours each day. This neighbor said she was glad when I moved in, because this stopped for her. Part of me wants to 'take one for the team' and just suck it up so my Mrs. X doesn't bother our other neighbor anymore. I believe my Mrs. X got home tonight, and I'm truly dreading seeing her because I really feel like I need to tell her face-to-face that I don't want to trade babysitting anymore. But then, I don't want her to show up on Monday morning expecting to hand off her kid, either. So I guess it will have to happen, sooner rather than later. What would you say in my situation? I think I'll start by asking if she got my letter, and I'll have to clarify expectations. If she asks me why, I guess I'll have to tell her that I think she's negligent; how do you do that tactfully? Would she even understand if I don't say it outright? Should I try to explain my point-of-view, or just leave it at "let's be done"? Too much, c'est too much.