Nope, that is a good point.
I think I wrote my original message in a slightly distressed state after a quite bad event where she needed to get in contact with anybody and couldn’t.
After some thinking and time away from that scary incident it is quite clear that this mostly is a XY situation (as someone thought) and just getting her a bracelet for her alarm is probably as big a technological fix there can be.
I think there are a few of those, but as with everything targeted to scared relatives/caretakers it is quite expensive and hard to tell how it will age.