I would definitely have a specialist farrier come in and look at her. I would strongly suggest against nerving her though. I have seen some horses that do ok with it, but have seen many more that stumble and fall and they are prone to abscesses and bruises because they cannot feel their feet and therefore don't take as good a care as to where they're going and what they're stepping on. There are special shoes and pads to relieve pressure as well as gels and things as well. There are also supplements that help to relieve inflammation. I have had really great success with a supplement called BL Solution. It has made numerous arthritic, ringbone and navicular horses very close to pain free and some of them were very rideable for years even though their xrays and ultrasounds looked like they shouldn't even be pasture sound. I would definitely try some alternative therapies like chiropractic and massage as well. If you treat the whole horse it will be easier for her to deal with her feet and it will keep her more in balance which will help decrease the pressure. I would strongly suggest trying as many alternative therapies that you can but don't try them all at once. Do a trial and error test period for each to see if it actually works. Changing shoes, feed, supplements everything at once you won't see what is actually making a difference and what is not. Also, with her being 6 you're catching it early and hopefully being able to "correct" the problem but she will not be a horse that is going to hold up forever. There will be continuing degeneration of the bones in her feet and her condition will still worsen over time. That being said, the more you do to specialize for her the better chance you have of getting many more good years out of her.