Talking to the mother's OH is not really an option - yes he seems lovely, but I'm sure he would tell her if DH tried to talk to him, and I don't like the idea of asking anyone to lie to or hide things from their partner, whatever the situation.
DH spoke to her husband a few times, about 2-3 years ago, to try to find out what things were like there as he was worried about DSD - she found out and went spare - called DH all sorts of names.
Only on Friday she was still going on about it - she says that DH destroyed her marriage by speaking to her husband.
I don't think DSD is having an awful childhood, but I do think that there are definitely serious problems which need to be sorted out.
As a little girl she was very spoilt - I think everyone felt sorry for her because her parents had split up, so no-one ever said "no" to her. Now that she is older, she can't understand why she can't have everything that she wants.
Very frustrating for me as I can see it all going on, yet I'm not in a position to do anything constructive.
I will speak with DH but in the meantime any thoughts on what to do next are appreciated .