So we took her into the vet, and strangely enough, she didn't know what it was...
She took quite a few scrapings of her ear, and two other spots we discovered issues with (which I'll explain below), and looked under the microscope there, but didn't see anything strange.
Before going in, while washing her with a medicated Shampoo (Hexadene by Virbac), I felt a rough spot on her ski, on her back, like 6 inches away from her tail. When looking closer, the hair was coming off in clumps, and the skin was sort of old and yellow and mushy, like a scab that's sitting in water for an hour... It is about an inch wide and two inches long. In the days since all the hair fell out and we washed it, the skin has gone a dark brown colour.
And on top of that, we noticed a few dried up blood clots on her head, as if she was bitten by some huge mosquito. They weren't just surface scabs - they were raised like pimples.
The vet initially suspected ringworm for the back, but the initial microscope viewing in her office didn't show it, so now the samples have been sent it to grow cultures to see if anything shows up, and if not, apparently, the next step is to do a skin biopsy...
So $400 in at this point, and we still know nothing... We're treating it by rubbing Tinactin on the spots and spraying Vetericyn and adding DMG immune booster liquid in her food.
At least it's not expanding to other parts of her body at this point and is localized, though seems like 3 different issues (ears, head and patch on back).
Would anyone get a second opinion or have ideas what each could be?