From the bits I've seen of the Alice/Kate storyline so far, its mostly just Alice. Kate is too busy either being confused or a damsel. But each to their own, it's good you're getting enjoyment from it.
The interview was very interesting though.
https://www.youtube.com/watch?v=IEE442sKL6E
So, she used to be a competitive swimmer, and was training for the 2012 Olympics before deciding she wasn't enjoying it and quit. I don't find it surprising at all that she was/is a model. The interviewer and interviewee agreed that actors that don't work on, and improve, their dialect/accent are probably lazy. And they talked about making the most out of bad writing/dialogue. For casting purposes the Brits often find her to be "too American", lol.