Because she is chipping is no reason to put shoes back on her- all she needs is a mustang roll on her. It is just a simple roll of the toe. She is chipping, and if you drive a nail through her already weakened hoof wall, it will just make it worse! That shoe is just hiding the fungus underneath, and the previous nail holes that are growing out are the reason behind the chipping. The nails drive fungus deep inside the hoof capsule, and when you pull the shoes, you have to ensure that the nail holes can grow out- the laminae needs a chance to rehabilitate.
Im a natural trimmer, I follow Ramey, all 4 of my horses are barefoot. One is a jumper, one is a reiner, and the other two are younger horses. I have never had any problems when I pulled shoes and started a horse on natural trimming methods. Usually when a farrier will pull shoes, he wont bother to rasp down the nail holes, even the wall, or even make the heels even.