If Paige is smart--as she seems to be--she'll just be gathering information at this point. It's really intelligent of her to just follow down leads without a set idea in mind. If she's really come to think that something's going on with her parents, then this is real and it's serious, and it's no time for her to be imagining what these two adult strangers could be up to with her 14-year-old mind and trying to look for evidence of it. Much better at this point to just examine anything she can for weaknesses.

And that's what she's done: she's got the bedroom door which she's checked twice that we know of. Once she got a (sexy!) dead end, once she got mom in the laundry room folding at 3AM. Hmmm.

Then she's got her mom's suitcase. Obviously the 2 months away with no visitation has pinged her as another odd thing, so she's poking at the weak spots of that. She doesn't have much evidence of Elizabeth's time away, but what she's got she checks: the luggage (clean), the address staring up at her with the card. Easy as pie to check that out--as easy as opening the door instead of just trusting that whatever's on the other side is okay.

It's really in a way better for her to just be living under the same kind of free-floating paranoia as her parents are because she has no idea.