The suggestion surprises her — though she had a feeling that he was getting particularly annoyed by it (not exactly by the window itself but the entire attempt of opening it). And that he would rather deal with it now than endure it for the rest of the trip, hence his offer to help. Understandable, really, but still it was better than nothing. She gives him a slight nod before moving back a little from her seat to allow him space to work on.

"Go ahead." If it still doesn't open — and she's hoping it does — she'll just have to deal with it like everyone else.