I would like to know what the scabbing is along the edges of her ears, it has only recently showed up and it doesn't seem to irritate her but it looks dry and she's loosing the fur in the infected area
This kind of things can happen because of different causes. One is parasite problems, fungal infestation, autoimmune dermatitis, Inflammation of blood vessels, skin cancer etc
In my opinion I recommend you go to the vet to do a good scan . The vet could do a blood test and a scraping of the area. We can’t forget that there are some diseases which can produce that kind of injuries too, like leishmania for example. Only with the correct diagnosis you will have a good treatment for your dog.
I hope I’ve helped you and Roxy gets better soon, regards.