Couldnt you just lock your door and bring the child to the door ready to go when she arrives? That's what I do, doors locked, parent knocks I open it grab the child they get ready and I usually lead the goodbye with telling the child to have a good evening and see them tomorrow...the parent gets the point usually! Another thing I do when it's nice out is have bags ready to go, kids outside playing so when parents arrive they are ready to go!