Hello Mary Ann,
I continue to think about you and your family, hoping that things become a little easier with each passing day.
I can relate somewhat to how your SIL may be feeling right now. My father just passed away at the end of December. For the last 18 months of his life I spent every day with him, either in the hospital or in the nursing home. These visits gave me purpose, so when he passed away it left a particularly large hole in my heart. I'm still struggling...but I am slowly moving forward. I hope your SIL is able to do so as well.