First off, your florist would be the best person to ask (I'm far from an expert but I've seen my fair share of bouquets) - though I understand may be hard to communicate with a florist in Mexico. Some purple flowers to look into:
iris
purple haze roses
purple/magenta mini callas - (one of my favorites!)
fresia
The bouquet below has some purple accents in it among others - the purple flowers are:
fresia (bright purple)
dalias (big flowers)
mini callas are in there too, but are orange in this bouquet - but they come in magenta as well.
I don't know if these flowers are available in PV, but it would be worth asking. You may also want to search for photos of bridal bouquets that you like - then send them the picture to see if they could duplicate it or mimic it.
Good luck!