Here is an unfortunately all too common story of an ex-wife who takes her vengeance through her children. The daughter's side of the story is so common--even without such extreme measures.
More parents need to recognize that divorce is painful and mothers especially need to help their children understand that they are loved but not required to support their mothers. It is unfortunate that children feel they are their mothers only source of strength. Divorced mothers need to work hard to make sure their children understand that they are still a whole human being who doesn't need to saddle their children with feeling responsible for the mother.