I pretty much love Carolyn in any shape and form, but I have two personal favorites....when Carolyn was under Barnabas' control and when she 'grew up' as another poster put it during her time with Adam.
I liked Carolyn as Barnabas' slave because she did her first complete 180 turn then.....from the wild, spoiled girl she was at the start of the show to the obedient, zombielike slave she became during her time under Barnabas' powers. Someone complained about Carolyn's compassion for Julia at one point, I think it was great....it proved that even under Barnabas' powers, Carolyn still had some feelings underneath there....she just couldn't exercise it as much as she used to because her loyalty to Barnabas had to come first.
I always loved her relationship with Adam too, she may have seen him as a child, but she showed great compassion for him something he so desperately needed what with the police after him and his creators wanting to kill him. She was very sweet to Adam, I loved seeing that side of her, seeing her care for him and taking care of him and it did prove she had indeed come a long way from the spoiled little rich girl she had started out.