It could be worth considering the very limited range of the frequency band of FMR/GMRS. If it suits her needs, itīs fine. Otherwise CB may be better.
Iīd also try to gage her level of knowledge about the topic and the actual use cases.
For an elderly person I would select a model with an easy to read display and good ergonomy. Iīd probably go for a Kenwood. Coming from Europe I do have a good overview over the US market.
_________________________
If it isnīt broken, it doesnīt have enough features yet.