There has been a lot of speculation about this woman, her maturity, etc, but not much said about her mental health, other than in a derogatory fashion (ie "she's a nut.") But what occurs to me is that no one seems to be taking seriously the idea that perhaps she has a bona fide mental illness. People with mental illness are perfectly capable of making elaborate plans and carrying them out, even if the plans don't make sense. Someone who is experiencing a psychosis state, like mania, might do exactly what she did and not think it was unusual at the time. Psychosis would also explain why she made up her story--mental illness doesn't make you stupid, but it profoundly affects your judgement.
I hope she gets the medical help she needs (mental illness is as much a medical problem as a mental problem) and I hope her fiance sticks it out with her. If she ever needed her family, it's now, when everyone else is turning away. Mental illness isn't pretty and most people are not very understanding about the anguish it puts a family through.
Cathy--mom to a kid with bipolar disorder. If you haven't seen your kid swinging from the chandeliers, you don't know what crazy is...