It was Beth, who wrote Kate's book, that volunteered to go to help out at Disney and brought her daughters. I just saw the episode not long ago, I'm sure it was Beth, not Carla at Disney.
I still wonder what happened with Beth, she actually used to pop up on some message boards very early on to defend Kate.
i think she retreated to her private life which seems to be pretty full.
according the 'multiple blessings' publisher's bio on her she had returned to college to get her degree and there's a realy nice article/interview she gave in her (and the gosselin's former) local newspaper from 12/08 that talks about her having her 4 kids and a successful sideline as an artist.
maybe there was a falling out over jon's name being added after the fact as an author of 'multiple blessings'. it's not spoken to in the december article but she does say in it that when she and kate were working on it they would lock themselves away for up to 72 hours and their husbands would watch the kids. she also said as to the division of work on the book that she (not we, not kate and john and i) wrote it.
she seems like a kind, classy lady.