Personally, I would stay out of it and remain a fence sitter. If the othe women have issues with her, let them be the ones to address them.

I am in a similar situation at my playgroup. One of the newer women to our group is different from the rest of us in how she parents and the other women have taken a real dislike to her because of her differences. I personally have nothing against the woman, and feel a little sad for her and believes that she desperately needs friends / people to listen to her or even just hang out - she is definitely struggling with being a mum to her 3 young kids. I refuse to be dragged into the other women's issues with her (even though there are some very real issues - they don't actually affect me or my children in a way that I feel is detrimental to us). They can deal with their own issues with this woman. For my part, I am not willing / able to take on board her problems as my own, but I am willing to be friendly with her, talk with her and not ostrasise her myself - even though she isn't typically the type of personality I would usually gravitate towards. I have even gone so far as to try and include her in BB meet ups and inviting her to ither social catch ups in the hopes that she may meet some people who she will 'click' with. It doesn't cost me anything to do this and I myself have been in a position where I have been desperately lonely and lost and not had anyone.

IF her children or herself were doing something that specifically affected me or my kids, THEN I would be inclined to address the issues directly. Until then, it is not my responsibility to try and 'fix' or resolve the things that are causing issues in her other relationships.

Of course if she asked me directly for my input and / or help - then I would be forthright with her about my opinion.