[drache]

that looks pretty nasty
I cannot tell by looking at it what it is
also - I am no expert
I would soak her a bit in hand warm water, try to clean the lesions to get a better look, gob some antbiotic ointment on the lesions and I'f want to stick her into a clean environment, unless it freaks her out too much
there are people here with much more experience than I
above scenario would be me - winging it
hope it helps
best wishes