I know how you are feeling David. My wife just wrote to me about moving all of her things out of her house as well, and asked me if I wanted her to be there when I get back (I'm on a two month road trip.)
Personally, I don't think it is a good idea to be there when she comes back. You, and I, are too emotionally attached - seeing her, especially seeing her moving stuff out, is not going to help. If you have to be there, I think being positive and cheerful but not going out of your way to help her is probably the way to go. I understand how difficult that seems, but getting emotional about it isn't going to help your sitch.
Good luck.
W 34 Me 42 Married 7 years together 8 0 kids 1 beloved dog BD 4/6/2018 I moved out 4/7/2018 I moved back in alone 8/05/2018 I file 3/06/2019 D official 5/7/2019