Does she have a smart phone?
We take care of my MIL (87, ALZ), and we got her a version of life alert with the necklace. She would either take it off and forget it, or she'd play with it and hit the button all the time.
Luckily, the MIL had an iphone before she started going too far downhill, and I put Life360 on it, and make sure my number is on speed dial, and my wife and I have specialized ringtones that she recognizes and makes sure to answer, even if she is half asleep.
It's a pain. Sorry y'all are dealing with it.