There is very little doubt that Queen Elizabeth did a wonderful service as Queen over the last 70 years. She as loyal to the people of the country and the country itself.
Some two years ago she indicated that she is going to reduce her responsibilities and in the year she would be 95 leave those to Charles - but not anything connecting to the Church of England of which she is the head. However, the funeral of Prince Phillip was a small limited number of family members affair, and she did attend the recent memorial of Prince Philip.
However, for the rest she never attended major Church services since November, when she did not attend the Memorial Service in November, or the Christmas service in the Sandringham church and is now not going to the maundy service this coming week,
Will she remain as queen until death - like her ancestor George II did - and has Charles acting as Regent in her name? That could be the situation because she disliked the idea of abdication as happened in the case of the two Dutch Queens (Wilhelmina - 1948 and Juliana 1981) - the third one being Beatrix in 2013.