Parents tip for young girl.?

Hello everyone. i am writing concerning my nine year old daughter. She has been an avid masturbater for some time now, almost a year. ive sat down with her and given her the "talk" but she still Persists. Problem is ive noticed bad rashes on her and she even come to me with them. we did visit a docter who gave us some rash cream and said i should try to talk to her. should i go out and buy her some lubricant, since she doesn't want to stop, and it is hurting her? Thanks in advance.