I would first keep her on paper towels in a QT type enclosure until healed. Clean the wound with Chlorhexidine or betadine (if you have it) and then when dry, cover with a thin layer of Neosporin. Make sure her enclosure dries out every day if you are misting it, in order to help the area heal (it will not heal if the enclosure is too wet). The wound looks fairly minor and should heal up fine. No need to make her drop her tail. That would only be necessary if the tail became necrotic and did not heal over a longer period of time. She may have shedding issues around the wound until it is healed, and shedding may pull off the scab. Be aware of that, helping to remove stuck shed around and below the area (which might constrict the tail) without removing the scab if possible.