Your mum's blood glucose levels seem absolutely fine and on track for getting normal Hba1c in the not too distant future.
I am pretty sure that without a meter to check on the effect, that Gliclazide could be dangerous - it hammers insulin out of the pancreas, and it would be illegal to drive without checking levels. If you are reluctant to take the advice of that nurse the non provision of a meter would be a perfect excuse for not taking the tablets.
I am probably rather anti tablet due to my own experiences after diagnosis.
I know that I am lucky to be able to get Hba1c just at the top of normal simply by eating a low carb diet, but I do feel that it ought to be the first thing to try after diagnosis - it is just a pity that so many drs and nurses seem to wilfully ignore any successes brought about by it.
I totally agree that diet and lifestyle should be taken into consideration and that is the way mum wants to progress. It was another alarm bell when the nurse said 'oh, dvsa.....oh not to worry' so she never mentioned anything about driving!!
I'm really not happy about the lack of treatment, empathy and just listening. It seemed like she was on a script that only read...get her on drugs, because she dismissed everything that did not relate to the drugs!