I'm so sorry to hear this. I would also take her to the vet asap. Did you notice any black specs on her? If so she may have fleas and this may be the reason she's loosing her fur or it could be a hot spot caused by stress or food allergies. Hopefully it isn't ringworm.The black area on her face could be feline acne if it's on her chin. I'd definitely have a vet check this out. I sure hope it's nothing serious. I'll keep her in my thoughts and prayers.