They make blood stop powder that will clot it. Or smear heavy grease or vasilene on the tail. Don't know the dimensions or your capabilities ...but sounds like she needs a bigger pen if it continually has contact with a wall or wire.
Also try taking her out and putting her on a chain until the tail completely heals.
No docking of a ybmc. Its illegal in British Columbia and a morale sin around East Texas.

Hope it helps bud.