...in the pitch dark?

Yes Dianne first then Fiona from their statements.
"However, she states that
KATE had repeatedly commented that, on arriving at the bedroom, she had found the the window of the room, with its shutter, both open. Yet, she [DW] did not notice, while at the entrance to the room, if the window was or was not open.
- However,
she wants to stress that immediately afterwards, she went outside the apartment in order to ascertain whether she would be able to raise the shutters by hand from the outside, and found it was impossible for her. (DW)
"And by that point Kate was already saying that the, what she'd found when she'd gone back, which was that the, she'd found the window open and the shutter open and she was convinced at that point that somebody had taken, taken Madeleine and that's what she was telling me and I was like 'They can't have done. I've already said earlier the shutters were very heavy.
I didn't actually open the shutter in that room, we went, I went to the front of the house and I was trying to lift the shutter at the, at the back, just to prove whether, you know, whether it could have been opened and whether Madeleine could have opened it from the inside'.
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'And''
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'I mean, it was fairly obviously, I think, that that wasn't what had happened and what could have happened'(FP)