What is she looking for in the divorce judgment? In reality, if she got half of all the money except for the house equity, and you are raising your daughter (presumably without financial help from her?) then it doesn't seem like it was that bad a settlement (unless she was a SAHM for the duration of your marriage and would have been entitled to some spousal support).
Truthfully, she probably is mentally ill or addicted but if she had her own lawyer during the divorce proceedings I don't see how she has a case. If she didn't and has some kind of official diagnosis other than midlife crisis, she might have a case. Consult with your lawyer and take his advice on how best to handle it. And if you do have to pay something more, bear in mind the original settlement probably wasn't completely fair because she as in such a rush to get out.
None of that excuses the bullsh!t she has thrown your way, and she might not be mentally ill but just have a personality disorder. What do you think it is? Bipolar mania, drug addiction, or personality disorder? It's definitely more than just garden variety MLC. (You might want to read DnJ's original threads - he's in MLC forum - his wife was similarly crazy).
The worst thing is the effect on your daughter. I'm glad she has her own advocate.
