I don't know if I'd say anything. As a mother who has had my kids in home daycares, if I suspect that somethings not right I never questioned my child in the doorway, I'd question the care giver! Do you think it's possible you're reading into this too much? If she has a real concern I'm sure she'd say something, not just hint at it. Or maybe just reasure her... "all kids go through this phase" or " my sons doing the same thing when we go to gramma's " ect. Something to reasure her but make it light. If there isn't a problem, then don't create a conversation about it.