Pomeranian losing her fur?

My pomeranian is losing her hair not shedding it.She has these attacks where she bites then rips the hair off her skin.She has thin balding spots on her.on top of combing her twice a day she gets snarls as well.I put a shroud over her neck to avoid biting the skin.I was told to comb her skin with emu oil yet it's not working is there anything one could recommend? It's Saturday I'm taking her to the vets on Tuesday to have her looked at.Any advice appreciated....Thank you kindly.