I've done some testing with Kate. I think there are too many issues that arise from trying to make a "thick" girl with some good meat on her bones from the "thinner" girls we have already, so I'm working on a new body shape that will work well for this type of girl.
I hope to get it into the coming update, which might hold that off a few days more but I think it will be worth it. If it turns out that the new shape will take longer than I'd like I'll go ahead and release the update first and then finish her later, but if all goes well we'll all have a nice new body style to play with.