None of my parents call to speak to their kids. It is disruptive to the daycare and the kids. If anything, it's more harmful than good for the kid. She is doing it to appease her own guilt of having to leave her child there...this has NOTHING to do with the child and everything to do with HER. I would put a stop to it now by either telling her straight out...no more calls unless it is to tell me you're going to be late/early at p/u ....or just not answer the phone when she calls.