My apologies if this is a repeat but what I see on the stand confirms my opinion....
This GM was/is/will always be a very controlling woman.
She probably (IMHO) controlled everything, everything single thing in and around her household.
She felt she could portray 'the perfect family life' if she kept control of everything that went on under her roof.
Nobody need know about any drug use, wayward adult children, or other family skeltons because GM was in control.
To everyone on the outside this was the almost perfect family, perfect jobs, perfect everything because GM controlled what information got out.
I'm sure the people she worked with thought she was controlling but had an almost perfect life.
But NOW! Here she is trying as hard as she can to keep control but little by little it's coming out that whatever went on under that roof was NOT so perfect.
She's angry. Not at her daughter but at 'the system' because 'they' are making all the little secrets come out.
This is why she is soooo darn rude to everyone...she's angry. Feels it's everyone else's fault that her perfect life if being shown the facade it was.
OK, just rambing and thinking out loud right now.