My daughter's vagina is turning greenish inside. what could be the course?

Time to see MD: It is time for your daughter to see a MD, a Pediatrician if age appropriate or GYN if not.

Foreign material : Infants or children with vaginal discharge often have retained foreign material trapped inside that triggers the drainage. I have see this be feces, toilet tissue or unrecognizable gunk. Minor amounts might respond to paddling clean water into the vagina in the bath. Persistence would require a direct exam. This may be done in the office or if needed under anesthesia (by OBGYN).