I notice she says there was one child left and the woman was there to collect that child. According to her colleague;
The witness immediately helped in the searches, whilst her colleague Charlotte remained at the crêche, looking after the other children that were there and waiting for the arrival of the last parents, after which she also began searching.
http://www.mccannpjfiles.co.uk/PJ/JACQUELINE_WILLIAMS.htm
Well Charlotte doesn't say she left early. And it might have been later. for When Charlotte arrived Kate is outside.
A different time to Amy.
Looking at Amy's statement she doesn't actually say what alerted her to the issue.
"She confirms that, on the night of the disappearance she was on duty and immediately went to the bedroom to see if the girl was hiding. She saw that the shutter was raised and that the window was partially open. It was then that she began to look in the wardrobes to see if the girl was hiding."
Where was she when on duty?
Maybe I was wrong thinking she had to come all the way from the Creche. Maybe she was at the Baby Club?
"She confirms that she works as head of the Baby Club and Mini Club, the former being for children aged up to eleven months and the latter for children aged between three and five."
http://www.mccannpjfiles.co.uk/PJ/AMY-ELLEN-TIERNEY.htmIf that was the case she could get to the McCanns apartment at the same time as the others as it is from basically the same place.
http://www.mccannpjfiles.co.uk/PJ/JACQUELINE_WILLIAMS.htmEven thought Jacqueline stuffs that idea up "That on 3rd May at about 22.05 she was working at the Mini Club, at the "dinner time period" together with colleagues Charlotte and Amy, when a female individual arrived, whose name she does not know, just that she was the mother of a child there (belonging to Toddlers 2), being a guest who was staying at the resort and who left at the end of the week, who told her that a girl called "Maddie" has disappeared, and that the girl's parents needed help in looking for her."
I'd like to see them interviewed again.