If I may weigh in here...in casting the show, we obviously had dozens of options for casting the role. When I went to Stephen Schwartz to speak to him about it, he described Laura as the "ideal" Catherine.
You really should have seen her original material at Joe's Pub, it showed you quite honestly, what a vulnerable, lovely person she is. Onstage, she plays cold and icy very well, I will agree and perhaps she has been a bit typecast in that kind of character. That may be part of the reason I cast her as Catherine. It will give people the opportunity to do something different. Either way, after hearing her sing I Guess I'll Miss The Man and Love Song with Michael today, she'll break your heart.
"There is nothing scary about life, if you are not attached to the results." - Conversations With God