I agree Lace.
Also IMO Kate was desperately hoping and praying that Madeleine may be returned at any time. So to have packed all her clothes and belongings away as if she didn't exist any more would have felt almost like a resignation/acceptance of the fact that she would not be returning - and that thought was too much for her to bear. It was just one way of coping with the situation imo.
They didn't pack them away. Tabloid report, so a handful of salt needed, but a normal reaction imo;
when they moved to an apartment near to the one from which Madeleine was abducted, they unpacked their missing daughter's clothes, too, laying out her pyjamas on what would have been her bed.
http://www.telegraph.co.uk/news/uknews/1552763/Were-not-going-back-without-Madeleine.html 27/05/2007
Were those the ones that ended up on Amelie?
Sydney Morning Herald May 15th 2007
"That was terrible for them," says John McCann, Mr McCann's elder brother, who has also travelled to Portugal to help search for his niece.
"Kate dressed Amelie in her sister's pyjamas and the baby said: 'Maddy's jammies.