Sorry for the above, I just couldn't resist.
Seriously, I had a GoS sow with extremely long toenails and eventually I called in the vet to sedate her, he/we used hoof trimmers and a paring knife...a year later they were as bad as before. She had no problem in coping and was always a great mother...my advice is unless the toenails are causing distress or are preventing her living a normal healthy life, leave well alone.
Farmer