You originally stated that your hen is lice/mite free, so there's no reason to treat your hen with anything at all. Here's info about Poultry Protector, see post #2:
https://www.backyardchickens.com/t/681509/what-is-poultry-protector
She found lice on another one of her hens. If one has it, they all need to be treated.