So sorry to hear the news Margie. When my wife's father passed away several years ago, he was home alone. His wife had gone to look after an elderly lady. Sue had spoken to him that day on the phone (which is a blessing). I still cry when I think about it.
Your mom isn't alone anymore. And she's not in pain. She doesn't have to struggle to hang onto life. Although I grieve your loss, I know in my heart that she is in a better place.
Hugs to you and your family as you mourn you mom's passing.