I genuinely do not like Mia in any facet unless dealing with her children. You can tell her soft spot are her children, but, other than that, she is as fake as the work she's had done.
But, regardless, Potomac continues to bring IT with their seasonal workings. How people can sleep on this franchise is beyond me.
Sally was always significantly older than Nancy. Even though the characters were created around the same era, Nancy was born onscreen in 1974 while Sally was adopted (why, when it appears she had Gordon relatives who would have wanted to raise her, is unclear) about age 11 in 1975.
When they aged Amanda in 1987 they had already had a 14-ish Matthew for the Mitch storyline, but Amanda didn't really get a teenage cohort like Marley and Nancy. She was friends with Julie Anne Edwards and I think they were supposed to be the same age but since Julie Anne was also working at Cory Publishing they didn't read as teens.