A lifeline seems like a sensible precaution. Have you had a look at what's available? Does your mother have family members and/or caregivers visiting regularly?
Phillips company have a few good options here in the US. Go to their website for more info. Thry usually charge $25-35 per month and are self pay (I think).
Thry usually charge $25-35 per month and are self pay (I think).