Right leg is slow. Start syndopa plus?

My mother, who is 68 years old, is now having trouble walking since her right leg has suddenly started to run slowly compared to her left leg, although the latter is functioning normally and as a result, she occasionally experiences balance problems and can't stand alone.Five months ago, her blood sugar was discovered to be high. A neurologist then identified the problem as diabetic neuropathy and prescribed gabapin 300 (1-0-1), dulot 20 along with other medications to regulate sugar.  the sugar level returned to normal.Again, after 3 months of taking the above medications, blood sugar is now under control, but walking hasn't improved all that much, especially with the sluggish right leg. Moreover, her right foot is little  numb. Can we suspect parkinson and start syndopa plus?  MRI spine, mri brain all are normal. thanks