You are not seeing "squashed up". "Up" is paired with "against". Her nose was "up against" the window and thereby squashed.
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You are not seeing "squashed up". "Up" is paired with "against". Her nose was "up against" the window and thereby squashed. By the way, standard US English does not recognize "squash up" as a fixed expression, but I can see how it might be used the way you say, and https://dictiona