What medication is your mother on?
If she is controlling her type 2 by diet with or without the most common drug for Type 2 diabetes Metformin then I would suggest continuous monitoring might not be the best option and that a simpler meter would be better.
However gir type 1 diabetics or type 2's on insulin or some other meds where there is a danger of dangerously low blood glucose levels then continuous monitoring is an option worth consideration..
Continuous monitoring is still a relatively young technology so still as issues with cost and reliability of sensors. Also control of blood glucose levels in type 2 with diet and Metformin is not like controlling the speed of car by watching the speedometer, for most type 2's blood glucose readings are used as a general guide to the effect of various foods on blood glucose level.