I'm really just teasing about the breeder, some of 'em are really funny about "their" cats - they never really let them go. I used to take my champion back to "visit" his "birth family" - he was a son of Hatcher Granville's oldest tom (Sonnenhof's Apache of Barba) and was always glad to see him. He would call on all his cousins and uncles and aunts - he made best friends with Hatcher's "boss neuter" Kinkajou (they looked a lot alike) and they would "walk the rounds" around the house, shoulder to shoulder, making sure that all the kittens and queens were behaving themselves.
I'll bet what happened is that somebody bought a breeder's kitten and then couldn't put up with the Siamese voice or the Siamese personality, and rather than return the kit just dumped it by the side of the road. You might take a head shot, front and side (like a mug shot) and circulate it to local breeders seeing if they recognize her. There is a strong family resemblance in most breeders' bloodlines - I could have picked any of MY kittens out of a lineup! :-D
My husband's theory, and he's sticking with it, is that someone dump them. Maybe the pair were a gift and the giftee didn't want them. I heard the animal control officer who kept the male, said the boy was a sealpoint.