I would contact a vet like I said earlier.
But, widespread hair loss as you describe if the result of a mineral deficiency would more likely be zinc than selenium.
I gave her a bath when I got her (I use dawn too) but might give her another one just to see if it helps. I didn't use oil but that's a good tip.
I've only had her since the end of March and gave her the cooper supplements not even 2 weeks ago. I believed it to be a selenium deficiency so was giving her sel supplements and foods rich in it.
Honestly she's improved a lot since I first got her but if someone was to see her (before seeing her previously) they would think she looks bad, that's how bald she is. She barely had any hair on her sides but now you can see what color she actually is. It just seems that she's at a stand still but maybe that's because she's not so bald anymore.
I will call the vet tomorrow and see what they say. I only have one reliable livestock vet in my area and they're over an hour away.
Thanks everyone for the replies! And here's some pictures. She doesn't like to stand still so I had to put her in a pen and she was occupied with some hay so I was able to get a few.
Thanks everyone. She's doing great and almost all of her furs come back in. They ran a blood panel test on her and everything was fine. They said it was more then likely hormonal.