The actress reveals she told her girls the plot to "Frozen II" after reading the script and immediately realised that was a very bad idea - because it could cost her a lot in fines.
"I came home and I was like, 'So, here's what happens...,' " she told "Good Morning America". "They digested it and they were like, 'Yeah, that sounds cool.' It was hard for them to picture."
"And then it occurred to me that I was in breach of my contract (with Disney) and I'm like... two weeks before Disney doesn't have a legal issue with me, but they have (daughters) kept it zipped."
The "Frozen" sequel is released on November 22.