You can add salt. That should help her face heal. Salt is good if a fish has an injury because it lowers the risk of an infection.
I add aquasonic tropical salts to my water changes so there's already some salt in there, and it says on the container not to add more salt after adding that unless you can measure the salinity of the tank and know what you're doing, which I can't, and I kinda don't.. Haha.
Here's the container:
Ingredients are (in order from the container): sodium chloride, magnesium sulphate, calcium sulphate, potassium chloride, potassium bromide, strontium chloride, sodium biphosphate, sodium thiosulphate, methylene blue. Recomended dosing is one leveled teaspoon per 15ltrs, but I'm lazy with my math and normally round it to one teaspoon per 20ltrs.
The guy at my favorite lfs recommended it to me when I asked him why his tanks all look crystal clear and his fish look great. I use it in all of my tanks minus my goldfish tank, not sure why now that I think about it... Maybe the "tropical" on the container subconsciously stops me haha.
And a blurry shot of the back, for S&G's
