Just do big daily water changes and gravel clean the substrate. that should dilute any disease organisms in the water and she should be able to heal up by herself.
If you can get some salt (sodium chloride), that can be used to reduce the chance of fungal or bacterial infections getting into the damaged tissue. However, if the tank is clean she should be fine without needing medication or salt. You might have some non-iodised salt in the kitchen cupboard that you put on food, that can be used.
Sodium chloride is different to Epsom Salts, which is magnesium sulphate and won't do anything to kill bacteria or fungus.
Monitor her wounds for red areas, these are bacterial infections.
If she gets white fluffy stuff on the damaged areas, that is Saprolegnia fungus.
Both of these can be treated with salt (sodium chloride) if caught early.
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SALT (sodium chloride)
Using Salt to Treat Fish Health Issues.
For some fish diseases you can use salt (sodium chloride) to treat the ailment rather than using a chemical based medication. Salt is relatively safe and is regularly used in the aquaculture industry to treat food fish for diseases. Salt has been successfully used to treat minor fungal and bacterial infections, as well as a number of external protozoan infections. Salt alone will not treat whitespot (Ichthyophthirius) or Velvet (Oodinium) but will treat most other types of external protozoan infections in freshwater fishes. Salt can treat early stages of hole in the head disease caused by Hexamita but it needs to be done in conjunction with cleaning up the tank. Salt can also be used to treat anchor worm (Lernaea), fish lice (Argulus), gill flukes (Dactylogyrus), skin flukes (Gyrodactylus), Epistylis, Microsporidian and Spironucleus infections.
You can add rock salt (often sold as aquarium salt), swimming pool salt, or any non iodised salt (sodium chloride) to the aquarium at the dose rate of 1 heaped tablespoon per 20 litres (5 gallons) of water. If there is no improvement after 48 hours you can double that dose rate so there is 2 heaped tablespoons of salt per 20 litres.
Keep the salt level like this for 1 to 2 weeks. There should be a noticeable improvement within 24 hours of adding salt. If there's no improvement after a week with salt, post pictures of the fish, stop using salt and look for a medication that treats fungus and bacteria (preferably not an antibiotic).
The salt will not affect the beneficial filter bacteria, fish, plants, shrimp or snails.
After you use salt and the fish have recovered, you do a 10% water change each day for a week using only fresh water that has been dechlorinated. Then do a 20% water change each day for a week. Then you can do bigger water changes after that. This dilutes the salt out of the tank slowly so it doesn't harm the fish.
If you do water changes while using salt, you need to treat the new water with salt before adding it to the tank. This will keep the salt level stable in the tank and minimise stress on the fish.
When you first add salt, add the salt to a small bucket of tank water (2 litres) and dissolve the salt. Then slowly pour the salt water into the tank near the filter outlet. Add the salt over a couple of minutes.