Don't you think ROB would have mentioned, after returning to the dining table, if JT had taken Madeleine into 5D after she'd heard her crying whilst distantly passing the apartment via the carpark?
http://www.mccannpjfiles.co.uk/PJ/JANE-TANNER-10MAY.htm*snipped*
Between 15 to 20 minutes later her husband ROB and MO left, together, and went to see their respective children. As her daughter Ev was restless and crying ROB stayed in the bedroom.
Meanwhile, MO went to check his children and those of GM and KH. According to what he said, he saw the twins but he did not see MBM probably because he did not enter the bedroom. As he heard no noise he left presupposing that all was well, returning to the restaurant. MO told her that ROB had stayed in the bedroom.
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After having quickly eaten the main course she went to the apartment to take the place of her husband so that he could finish his meal. Her husband returned to the restaurant. Some time later, she doesn't know precisely how long, she looked through the lounge window towards the restaurant area, ascertaining, strangely, that there was no-one seated at the table it being that it was still very early for all of them to have already finished the meal.