Yeah it sure is strange talking to someone everyday for years and then not talking to them for days or weeks. If anything the lack of contact will help you to detach. Try to get out and do fun things if you are having a sad day.
That’s good you took down pictures and such. Try to get some new things and really make the place your own now. I put up a ton of sports memorabilia in almost every room after W moved out. Looks pretty cheesy but I like it and am proud of how it looks now.
If possible try to move all of her stuff out of the way or out of sight. If she does contact you remember to only rely if asked a question and keep it very brief. Good luck