Babysitter situation

My son is 3.5 years old and recently he was potty trained. He still does have accidents here and there when he gets too busy but doing well. He does also need help wiping his butt. We’re working on it but definitely cannot do it in his own. My daycare provider has been great but she will not wipe his butt. I know he tried to hold it and not poop there but he has a few times and he will come home smelling terrible with poop all over his butt. She thinks he should be able to do it on his own. Any advice here? He loves it there and has many friends but I think this is unacceptable.