Like others, teaching how to wipe is taught during potty training but it can sometimes take longer to learn how to properly do it. If they call me or if I smell them, lol, I make sure they are wiped properly. Dried poop is gross and can be sore, no one wants that! Most of mine are nighttime poopers though, lucky me!!

I'd apologize to the mom and explain that unless called in, they're on their own once trained. I'd let her know that I'd keep an eye on it for the next little while and encourage the child to tell you when she poops.