What a sweetie. I wouldnt be able to resist either!
The most 'bitey' cats I have found are those with owners who played rough games with them as kittens, tickling them and teaching them that hands are fair game. Your feral cat won't have had any of that, so you may well be surprised.
You could try with a hairbrush first if you are nervous - just get her used to being brushed first so she doesnt just see it as a threat or a toy!