I have been playing Perdita for a while now and I do not think that she the best by any means. She is good and relatively easy to use, however many masters will just destroy her hands down. To name a few: Nikodem, The Dreamer, Lilith
I've played against all these masters and lost, not that badly, but still lost
I still love to play her, she is a very fun and solid master, but not the best by any means.