Looks yam! Even I was blessed with a very loving and caring mother-in-law who never let me prepare Shir Khurma in her lifetime. Though we used stay in different cities but I used to make sure I am celebrating my Eid with my inlaws despite of my husband's absence when he used to be abroad. She was very quick and fast in every thing and specially cooking. By the time I used to finish my fajar she used to be ready with the Sheer Khurma. I used to assist her later for cooking but could never keep up with her pace for sheer Khurma.
I think that belief is true. Good people die soon. May allah grant all the departed souls the highest place in Jannah. Ameen🤲