8 year old has milky dishcharge from her v and her v is red. no itching or burning no foul smell. can this be a yeast or something else? how to treat?

Likely yeast: Most likely yeast infection, can treat with over the counter antifungal products like Monistat or gyne-lotrimin or similar products. If it doesn't start clearing within a few days she should be seen and the discharge and her urine should be tested for evidence of other types of infection or other problems.

See Doctor NOW: Vaginal discharge in a female child can have several causes: infection, irritation, foreign body (toilet paper), and more. Vaginal yeast infections are not common in this age group but can occur following recent antibiotic use. A detailed medical history and exam will be needed to determine the cause. See your child's doctor NOW for correct diagnosis and prompt treatment.