Hello and welcome to health care Magic . It is normal for young children to explore their bodies and in the process of doing so sometimes they can infect or irritate the delicate vaginal area .Excessive overenthusiastic wiping can also irritate the vaginal skin . Wash her only with plain water , do not use soap /dettol etc for cleaning genitals .Ensure she wears organic cotton /cotton underwear ,ensure that she at least takes 2-3 glasses of water in a day (this does not include other fluids that she is taking like milk,juice etc ).Ensure that her nails are clipped and she washes her hands regularly . Vaginal irritation can be lead to frequent urge for urination .Once you ensure that the child is taking enough water you should be able to see improvement . Sometimes worm infestations also lead to similar symptoms so see to it that is dewormed after getting a routine stool and urine examination done .