if she is going to stay in the house, you might as well start monitoring whatever you can within that house. i.e. computer usage, get access to the online billing, who is coming and going and what is being said when you are not there. can find out what has been done or typed in the past, but there is no reason you shouldnt start now.
they could very well be doing this through their work computers. that would be incredibly stupid but more than likely possible.
