Start by just turning it on and giving her a treat.
Start with just ONE nail at a time. I started with the front dewclaw (on my dog that still has them). I just touched the Dremel to the claw, then gave a treat and shut down for the day. It took days, but now my dog just sits there while I grind down her nails.
The Dremel is better than the scissor-type clippers because it doesn't crush the nail, which hurts the quick.
I don’t think she would do any better. We had to put a cream in between her toes because she was gnawing them raw. Allergy to chicken we realized. But just putting the cream on she freaked, even when we were trying to distract her with bits of steak. She won’t even let me rub her little paws. She gently removes her paw from my hand and then licks my hand, LOL.