So I brought her to the vet today, and the vet thinks it's related to her allergy problems with her skin. She said that the irritation probably caused a clot to form, and it basically cut off circulation to the tip of her ear, which turned necrotic and fell off! It could have also been an injury, but since she is no longer a rambunctious youngster who plays outside, I would be surprised if that's what it was. Her weight is still good and her scabs, although they aren't gone, are definitely better.
On a side note, one little town in the UP close to where I grew up, got 38 inches of snow during this latest storm they had up there. Go Painesdale! That's a lot of snow!