Love it. It's utterly gorgoeus, sophisticated, and very strong. One of my favourite girl names at the moment, actually. Both
Thea and
Dora are lovely nicknames, but I personally would favour
Thea.
Dorothea is also extremely beautiful and very elegant, and as far as I'm concerned, it's also much better than the more common variant of the name,
Dorothy.
I love both
Theodora and
Dorothea equally. Couldn't decide between them.