Deidre is much better in Chicago, I think, than she was in Nine. The music in Nine just isn't well-suited to her voice, it sounded a little too high for her or something. I'm no expert on these matters, but she seems to have a lower, belty-type voice, which works much, much better for Velma than it did for Our Lady of the Spa.
She's had a few runs as Velma now, both on Broadway and on tour, and while I wouldn't say she was my absolute favorite, she can certainly sing it and is a lot of fun to watch. (She also sounded great as Magenta in the Rocky Horror Show revival...I think she only got to go on once, though.)
"I cried during the Frug." - MC