My Mom has begun that decline with dementia and severe spinal stenosis, and we spent the holiday together, just the two of us. It is hard to imagine her being able to go out and do this in the future, as it was quite a project to drive us to a restaurant only a mile away... In some ways it is painful witnessing the rapid decline of a single parent, especially the isolation and confusion it can create-- obviously for her but also for her kids. In some ways it also seems to be a gift all around to be able to be there for her whenever possible. I am glad you were with your mom-in-law right before she died. I really believe that mattered.