Guinea pig advice Ring worm ?? x?

I have got my milly the gp from a pet shop she had ring worm i took her to the vet and she had cream i have now got it ,it onily comes upo after 4 weeks of haveing it i have held her twice a day and i have got the ring worm in 5 places so im worried milly has it theres no sign of her having it but im worried if she gets it im going to get it again and its going to be a bad circle and i also have 2 other gps who i dont want to get it and milly is being breed in a few mouths what would u do . ???? x