Gunsmoke, I know what your lady is going through. It doesn't happen often, but I've had 3 kids and once in a while, I'll cough or laugh and..... run. My kids think it's hilarious! Haha.
I use either the Fun Factory Smart Balls
or the Cal Exotic's L'Amore
System. Both are double vaginal balls attached, with a retrieval string. I have details on how to use them, (you don't just shove both balls into the vagina) in my L'Amore review.
I have found that this helps. I've done regular Kegels since I was pregnant with my first baby. I have had little problem with leakage until just recently and it is very mild and I can go weeks or months without it happening. I think years of Kegels have helped and I think the Kegel Balls not only help with this problem, but increase orgasm as well!