And now she is absolutely lost. She has no idea how to respond to this. This is not what she expected when offering a hug (though, to be fair, she didn't expect anything at all - it just seemed like the right thing to do).

She definitely doesn't know what to say, so she'll just... stay???? and keep her arms around him, leaning back against his greater weight to get somewhat comfortable. She's never comforted someone as a human, so she'll just do what she would have done as a cat and simply offer cuddles and her presence.