If Abby hadn't pressed assault charges for Kelly pulling her hair and slapping her, I really doubt Kelly would have sued her for Paige's mental distress. They are both idiots for involving the legal system in their craziness, but Abby started it. Taken literally they both have a case - yes Kelly did physical strike Abby, and yes, Abby was mean and threatening enough to Paige that it's possible for someone to interpret it as abuse (the chair throwing scene is pretty darn powerful evidence), but everyone knows both of them are hardly innocent victims in the whole mess (well, except for the kids - at least for a little while longer).
Holly and the rest of them not sympathizing w/ the two moms who have left was pretty unbelievable - Holly and Jill have both had quite a few breakdowns over the way Abby has treated their kids. So fake that they would take Abby's side like she's an angel - pahleez.