I think she was just an extremely uptight person in all aspects of her life, but probably knew it and didn't like that aspect of herself. I don't think this is a working mothers v SAHM debate at all, more a quality of life debate for everyone in the family. How much do you need, financially, to have that? Or rather, how much can you do without without realising you can?
I think the career thing with mo1 was partly an excuse because, I still believe, she didn't particularly like children just the idea of them. They were part of the image she wanted for herself, part of the lifestyle. Making lots of gueses here and I could be all wrong.
I was talking about this with a friend today who works part time. She immediately felt sorry for Mo1 and hated m06. I thought mo6 was great myself and seemed to have a very good understanding of kids. I thought her egg-timer thing about giving kids time-limits/guidance etc was brilliant. Didn't think the dummy thing was that confrontational myself (but could have been daydreaming at a particular point!) However, my pt working friend is a complete control freak about tidyness and mess and I am a complete slob. So maybe we are identifying with 'types' rather than whether they work or not.