I noticed the same thing rewatching a while ago, if I’m honest I think she hated the fact that David got more attention than her because of how awful he behaved and there was deep rooted insecurities because of that, that now in recent episodes they are treated both as equals and hense the spiteful behaviour has gone. Or she just grew up lol
Her mother Gail was very similar when marrying her first husband Brian incredibly jealous if I was Jason I’d have ran a mile and kept running they did tame Sarah for 5 seconds Tina o Brian is a fantastic actress
