Dog nail clippers will work, or any kind of shears, just make sure not to cut into the "quick" (the blood that extends into the nails where it is still growing. If you've clipped dog nails, you are already familiar with that. Roos also have spurs that can be trimmed the same way if they are too long. Spurs are rarely a problem, but can be on some roos.
Can you isolate her where she is still in sight and hearing of the others? Chickens are social, and by herself she may be under more stress than leaving her where she is.
Yeah, we've done dog nails before. Figured they were the same. We have to trim our rabbits as well. His spurs aren't too long, about the same length as his toes. Isolating her options are basically either a rabbit breeding hutch (its where they lay their eggs sometimes) or Dog crate on the porch, They would be able to hear eachother. If the other chickens hang around the porch (when its raining they do, or if they want treats) they could see her. But i don't have a extra coop or anything, I really need to build an extra one for isolation periods. My other option is to leave her in the coop/run during the day when I let the others out, then dog crate on the porch at night, the porch is enclosed so she woudl be safe from other animals.