I came into this one late, have had this happen when I found a home for one dog I rescued. The 1st owner found out I had the dog(how I don't know) and was very mad that I had rehomed her. (the pound had called me to get the dog out of there cuz they couldn't really do any good for her.) But then this woman wanted to place demands on me to PROVE to Her that the dog was fine.(the animal control had removed this dog and27 others from her care while she was in a mental hospital yup no one caring for them.) I had to get a court order to keep her awy from my home, please do not even give pics, and don't let the go between give any clue where sweet Lolly is.
Sorry if this seems hard nosed but been there done that.Don't want anyone to go though it.
PS In my case the pound put out the word NOT to give this lady animals.