What was the issue that the rest of the cast had with her? I hadn't heard that she was treated badly or not liked.
I believe, and I'm only working off of my own memories of interviews I read ages ago, so anyone more knowledgeable than me can feel free to correct me, that the biggest issue was simply that Diana Muldaur was simply 'an outsider' among the cast, that there was a tension between her and the original TNG cast, since she was replacing one of their own, and that it never really smoothed over in the time she was there. Not necessarily that she was treated badly or not liked, but just that she never really managed to get that 'in' to the core group.