If she keeps her phone/watch on her person, you can set up a dialing shortcut on the homescreen or watch that dials a neighbor, next to each other so she can dial three at once. She doesn't need to talk if they are aware that a missed, silent or hung up call from her means that she needs help. There are also neck pendants that do that in sequence or three at a time, including 911 if desired, like the Freedom Alert. And of course you can program a 911 shortcut.
If her neighbors are close by, potentially she could have a push to talk system/walkie or intercom type thing? Not sure about everyone's proximity.
Assuming she is being monitored as regards a feeding tube if eating/drinking is the problem, choking probability can be reduced with a zero tolerance policy on tough foods like corn, nuts, beans, rice, lettuce, raw produce...sometimes thin liquids.
Or is the problem mucus/saliva? We have a variety of suggestions for those.
Or maybe this is a "just in case" scenario...?