She has a long face, but I wouldn't call it horse-like. I think she's still an attractive woman.
Incidentally, this "horse face" thing goes back decades, but Parker actually re-appropriated the comment by joking about it her self in the movie Ed Wood (when reading a review of the play she was just in, she remarks, "Do I really have a face like a horse?"). By re-appropriating it, she renders the horse face joke null and void. 