Need advice for a WW who left

[dwh15]

Thanks Jeff. WW dropped off S8 about an hour ago. I had asked her to give me a heads up before dropping him off so I was prepared, but she didn't. She came in the house, said Hi to all the other boys, spent a few minutes looking for some crib sheets that we used to have, since she has a friend who needs them, and then left. It was all very pleasant. She seemed in a good mood, I was smiles and talkative, but after she left, I felt like I got punched in the gut. The face to face interactions are still hard.

Oh, she also gave me a 1-arm hug as she was leaving. Took me by surprise so I reciprocated also 1-arm, but not sure if that was smart or not. I never initiate but how should I be responding when she initiates stuff like that?