18 month old touching??

my daughters 18 months old, she still wears diapers as we are potty training but hasn't gotten hang of it yet. lately ill catch her putting her hands down her diaper.. i dont know if maybe she hates wearing diapers now or what. she will tell me when she is wet or poos but she will literally dig down there and i dont know what it means, if anything. i tell her no, and say that we dont put our hands down there but she continues to do it. help please. any mommies of daughters have this problem?