Just asked W if shed be comfortable doing something together on our anniversary. She said she's not in the mood for it.
Okay, that's your answer about celebrating the wedding anniversary. So, do not plan anything.
Since she continues to remind you that she came back home for the sake of the kids, I would suggest that you get a card for the anniversary......nothing mushy. I would prop it up against her morning coffee cup....or whatever she reaches for when she wakes up.
If you know of a store or mall where they have one of those booths where you sit inside and it automatically takes several snapshots while you make funny faces......I think having the kids pictures would be cute. Since you have a two year old...it may require you in the picture as well. You and D5 could make crazy faces & cut up....showing having a good time. Then when you get those pictures, save them to put inside the anniversary card. Just sign the card, "Thanks for giving me our beautiful kids". No ILY's or any reference to the M.
It's just an idea, but anything more will be extreme pressure on her.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!