My advice would be "if in doubt, see vet".
It's really hard to say from just a picture. How does she treat the wing when preening? Is there a specific place that she gnaws around on a lot? Has she always done this or is it new?
It's really hard to say from just a picture. How does she treat the wing when preening? Is there a specific place that she gnaws around on a lot? Has she always done this or is it new?