Daughter playing with poop

I have a 3 year old that I’m trying to potty train who is still in diapers and discovered that she can stick her hands in her diaper and play with her poop. I thought the first time was cute, the second time mildly annoying and just pissed today for the third time. She’s three so I don’t think they make onesies her size. And if they do she’d figure out the crotch snap and whip it off. Have any of you ladies had a poop artist? And how did you deal with it? Please help!