Or do you have a friend, neighbor, or relative you could have an agreement with that you would call her by a certain time. Say 10 AM just for example. If she doesn't hear from you every day by that time, she should call you, come to your house, or contact someone who could go and check on you.
I've also heard of services run by local senior organizations that have volunteers who call you every day at the same time. But it's never some ridiculous hour like 4 AM. You could probably request a (reasonable) hour to receive your call.
My own agreement is with my children, and it's fun. We all play Wordle and some of the other cell phone games as soon as convenient in the morning, each day. We post our scores and compare how well we all did. I usually do mine between 8 and 9 AM, and if they haven't heard from me via text, the next step is a text or email from them asking if everything is OK. If I didn't answer that, my son would come over, or call my next door neighbor, who has a key, to come over and check on me. Never happened yet, but it's comforting to know there are safety techniques like that available to us these days.