Check the link below for more information. Typically, home treatment lasts up to 4 weeks.
Ringworm is a fungal infection, the same type as athlete's foot. The same medicated cream can be used to treat ringworm.
I've had it a few times - once transmitted by a horse @ my barn, & once picked up in the soil & transmitted to me by puppies in my litter.
Interestingly, I was told by my doctor that some people are more susceptible to the fungus than others. Hence, I have gotten it more than once, & my husband never, even though we both cared for the puppies. Also, only 2 puppies out of 10 in the litter needed treatment.
Make sure to keep the areas clean & dry, & wash all clothes, towels & bedding to prevent spread or reinfection.
The only warnings I can see about it are to be aware of bacterial infections. It sounds like these are more likely in untreated cases, or when it causes itching, breaks skin or has drainage.
I don't know why your nurse said it was not able to be transmitted from your daughter to anyone because it came from an animal? It's not like guinea pigs have a special strain of ringworm! But make sure you take the pet to the vet to be checked for ringworm & treated if necessary.
Good luck, & I'm sure in another week you will start to see a shrinking/elimination of the ringworm spots. T.
http://www.nlm.nih.gov/medlineplus/ency/article/001439.htm