If you don't get a purple male, you could try breeding her with the pied peacock or a white male? If he or the white does not have the purple gene, none of the chicks will be purple.. but all of the sons out of her will be "split for purple".
For example.. pied peacock x pied purple hen= 1/4 white, 1/2 pied, 1/4 dark pied. No purples.. but ALL male chicks will be split for purple.
So if you keep say, a white male or a purple pied from this and breed him back to the purple pied hen, this will throw 50% purple chicks in both sexes.. (of course can't see the purple on a white bird)
BTW I meant to add.. your chick is still young, but an important difference between purple and cameo, purples get the shiny feathers on neck, cameo never get this. So you will know which one it is by 6 months old..