Ok, your explanation makes it a little clearer why she is asking for that. I don't think too many gritty details are necessary though. I believe that because...your lawyer's job is to make sure that your AH can't drag your childhood dirt into the court. Your lawyer's job is to keep the divorce on topic--and that means sticking to what happened during the marriage and how things could affect your children going forward.
Bringing your mother's issues into the courtroom seems so far off topic to me...it's manipulative and deflecting...and if your lawyer isn't able to shut your h's lawyer down trying this tactic, I sure hope the judge is smart enough to.
Certain family dirt isn't allowed into courts for very good reason, especially stuff that is ancient history before you were with your TBX.
If your lawyer doesn't shut your H's lawyer down when he tries to drag your family history mud out into the open, then your lawyer isn't doing their job.