"Love Saves the Day" by Gwen Cooper

From Google Books:

This is a story about grief, hope and healing. It's a story about the importance of memories, and of preserving a part of one's past. It is the story of a mother daughter relationship that shows that deep rifts can be mended even after death. But ultimately, this is a book about love, and how one small cat, through her mere presence, can change multiple lives.