CGI Eldress and Teela have a better mom and daughter relationship than 2002 Teela and Sorceress, and CGI aren't even related!
That we know of. CGI Teela and Eldress aren't related that we know of. I'm not gonna rule it out just yet.
Anyway, Eldress and Teela have a better mother-daughter relationship because they have an actual relationship! They talk to each other. They have had multiple complete conversations. Eldress has eased Teela's fears, she's reassured her of not only her powers, but of her own identity as an individual. She's mentored her and educated her. Everything a parent is supposed to do.
Teela and the Sorceress only have professional conversations in the context of Captain of the Eternos Guard and Sorceress of Grayskull. Any mother-daughter conversation they have is immedietly wiped from Teela's mind the next moment because the Sorceress can't let Teela know where she comes from for some reason? Even their conversation at the end of Revelation Part 2 fell just short of a true familial connection.