Toenail fungus

Hi MH,
I have read your booklet. Love it! You're right on. I have a question regarding toenail fungus that my mom has had for many years (at least 40 years). It's gotten to the point of a thick hard crusted toenail. Not very pretty. We have been using walnut hulls tincture which did clear up her fingernail fungus, but not the toenails. I'm interested in the oregano oil & olive leaf extract. Do you think this is what she should be using and how much for how long? Thanks, Sandy :)