You need to stop the itch. I have used "calm coat" with some success with my mare when she had an allergic reaction this summer and wouldn't stop rubbing her tail. It's all natural. Also, check the skin at the base of the mane. If it is full of dandruff, she may just need a bath. If it is abnormal in any way, I'd suggest microtek by equus as a safe and effective antibacterial and antifungal agent. For some reason, my same mare's tail got full of scabs this winter. It was perfectly clean beforehand, and she lives in a ridiculously clean environment. I applied the microtek 2-3 times daily for several weeks and it cleared up the skin problems and the itching. Good luck!