Wow, wow, wow. This was a really well written book! I think the author did a really good job of making me never know who's side I was actually on - Becky the mother or Meghan the daughter.
I was back and forth on who I believed throughout the entire story. (Though most of the time I was siding with Meghan...)
The ending was a very big shock (although now that I think of it, little suspicions that turned out to be partly right kept creeping into my head)!