B.S.
Put her diaper on backwards, and duct tape the tabs closed if needed. (or one or the other might work for her). I agree that onesie type shirts and overalls or one piece outfits would be a good preventative.
Also, if her hands get dirty, don't make a big deal, just wash her hands, change her, and move on. The more attention that's drawn to a negative behavior tends to make things worse.
It's normal for her age - she's not trying to make you crazy, I promise :) She's probably not enjoying being poopy, so it might be that potty training is in your (near?) future.
Good luck!