Sorry to disagree wth you, but what makes you think she isn't a nice person? Just because her model is being used as the shadow court "leading-member"?
Or just a random statement? I have read all the books/pages/diaries where Theresa and Lucien were being mentioned, but that still doesn't convince me she isn't a nice person. She might have her own reasons, but not something to judge her with.
Perhaps, perhaps not. I believe she wants to use the Spire for some odd reason. Maybe resurrecting her brother, lmao. Or maybe she has the same reasons as Lucien, but wants to take the mantle as Queen of Albion. But who knows what the DLC/ further expansions might reveal to us.
That's the exact same thing I do as well. I always do some blacksmithing until Rank 5, then buy the Monster's House, and some books in order to train my dog. Then, I see what I want to do, and if I'm bored enough, I'll continue the main plot.
I would like to reply with the same statement I had about Theresa (See first quote).