Check out this screenshot: When she is lit from the direction of the portal, she looks normal, otherwise she is completely black.
At the end of the game her hands are visible in first person. Those are also completely black.
Hello @mtmkls, let's track this issue in the Portal 2 issue tracker at https://github.com/ValveSoftware/portal2/issues/289.
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Check out this screenshot:

When she is lit from the direction of the portal, she looks normal, otherwise she is completely black.
At the end of the game her hands are visible in first person. Those are also completely black.