Cynthia Nixon in this movie?

Perhaps someone has already asked or answered this question on the boards for this movie, but I am exhausted and can't keep my eyes open long enough to look for it. I KNOW I read in an article (while Sex & the City was on the air) that Sarah Jessica Parker and Cynthia Nixon had worked in a movie together when they were both very early in their careers, and I'm sure that the article stated that the movie was GJWHF. I saw the first half hour or so of the movie for the first time the other day, and never saw Cynthia, so I came on here to see what part she played, and I didn't see her on the cast list. (Again, if I missed it, I apologize, my eyes are literally drooping as I type this.) Can anyone tell me if she is, in fact, in this move (maybe a bit part that wasn't credited?) or if what I read was an error? Thanks.