I think that her father said that she also had knee braces on. To me that would preclude her just "walking away". If she really had the money as her husband says, that would mean that someone picked her up and she left, presumably to start a new life somewhere, or her husband needs to be looked at harder. I know that everyone reacts differently but waiting 2 days to report a potentially suicidal person missing doesn't sit well with me. I could perhaps see that he might have been embarrassed at first to want to admit to anyone that she left, but in my mind once she was gone overnight with no contact with anyone I can't imagine waiting another day after that to report her missing.
I hope it does turn out to be an overstressed mom who just snapped and left. That would be the best case scenario for everyone.