My poor lady cockapoo

Hello all. Pretty please can somebody help or give advice. I have an amazing cockapoo she’s 7 months old now. The last three months she has started scratching quite Bradley behind her ears and head area. Three visits to the vets in total, ear drops, for cleaning ect ect. No Definite solution from them yet. I’ve changed her food several time and she has fish oil 1ml in her food as recommended. She still it scratching. Doesn’t have ear mites or flys and fully vaccinated. The scabby skin patches are under and on her eyes. Under her chin and top of her head. I’ve attached pictures and of some areas when she’s is now bald 😢