I don't think they have had time to build anything yet. It's only been a couple months. At this point they are just trying to find a way to get to the next day.
I think carol will stay around because they are not going to get rid of Daryl. And Daryl needs Carol to continue growing and to tie him to the group.
True but I get annoyed when the primary focus of a female character is to help a male character develop. I liked Catherine Sakai for herself in B5. Vash in TNG was a joy.
Still, with any luck the two of them will grow and develop together. I just wish Daryl would wash more often. Squirrel blood is not a great perfume.