Dose should def be checked w/ vet, I think anyone can overdose on anything whether good for you or not (ie vit c can be very bad if you od on it).
Not very familiar w/ the coconut oil so I'm not sure about the 2 together - someone here should know though
If she has FAD & there are
no fleas than she won't be itchy, so you have no fleas then it's probably not FAD