I guess that's possible. I wonder if Lois, the attentive mother, would have known most of Elizabeth's favorite clothes, and have been able to tell if any such things were missing. I'd imagine Lois was probably with Elizabeth when she bought most or all of her clothes.
Oh, come on!! At 14? I don't care how sheltered adolescents may be, they don't want parents snooping around their clothes and other things.
I thought we discussed this: she had all she needed for flight, Chinese red pyjamas! Seriously, wouldn't it be simpler to stash her clothes somwhere close by, like in her bedroom?