Well, Daphne recently had a baby, so she probably wants to be with her child. And even though it isn't really nice to say, Daphne looks older than her part now. She was Mimi almost 10 years ago, and she doesn't really look 19 anymore. Which isn't to say she isn't beautiful, because she is. But the mediums of stage and screen are different. You can't cake the makeup on in the movies like you do in a show.
"You can only become truly accomplished at something you love. Don't make money your goal. Instead, pursue the things you love doing, and do them so well that people can't take their eyes off you."
- Maya Angelou