NO 2X4'S from me.

I see nothing wrong with mirroring her actions, if she asks for a hug and you give it to her with no expectations then what is wrong with that?

At his point there is still no OM, so it it NOT cakeating.

She might be having second thoughts about leaving.
So the hug is her way of asking for reassurance.
For what? IDK.

Does she know that you are going away on Thursday?
Try to keep that as mysterious as possible. IMHO.