Hi C.! Have you asked your daughter why she is so against taking her to the doctor? If it is money, could you offer to pay for the visit and antibiotic (if necessary)? Of if it is time. . could you offer to take her during the day, since you have her anyway? I noticed some other people have mentioned strep. . .just thought I would tell you that there are other signs to watch for with strep. .those are stomach ache, fever(as you already know) and headaches. Usually my daughter's first symptom is a headache. This doesnt mean that she will have all of those symptoms, but it is something you can watch for in addition to the soar throat.
Also, maybe you could try calling in to the pedicatrician's office and speaking with a nurse. . .give her the child's symptoms and she may say it is going around and sounds like it may be viral (no antibiotics necessary) or she may tell you that she needs to be seen. At that point tell your daughter what the nurse says and then ask if you can take her in.
Either way, I don't think this should go without further investigation. Your daughter needs to make sure that her daughter is taken care of, whether it is you taking her to the doctor or her.
Hope it all goes well. Let us know how things go!