Chihuahua Puppy with Parvo?

i bought a 9 week old Chihuahua puppy with the Parvo Virus last week from a woman claiming to live in Merredin, she advertised in the Quokka as staying in Fremantle. i picked the puppy up on wednesday night and the puppy was sick by friday night, we took him to the vet on saturday night and he was diagnosed with the Parvo virus. we had to put him down saturday night as the virus was so far along. the woman said she had sold 5 other chihuahua puppies and she goes by the name of Leanne. has anyone else bought a pup in the last week or 2 from this person? we have been trying to contact her for the last 2 days and she has switched her mobile phone off. we are looking for answers. please help.