Cervical spondolysis. Completely?

My mother had dizziness+vomiting+loss of bladder control. 2 months ago in the morning.She was having extreme ear pain from some days before this.After this she had extreme weakness in hands and legs,headache.Dr said that she has cervical spondolysis and started treatment.After 2 months there is much improvement in weakness and dizziness.But even now if she stops/misses accidentally a dose of medicine (CINNARIZINE+DIMENHYDRINATE) which doctor has prescribed for dizziness ,dizziness comes again in next 6-7 hrs of missing the dose.After how much time she will be able to leave medications  for dizziness completely?She has also undergoing treatment of spinal ARCHANOID cyst.After how much time she will be able to leave medications  for dizziness completely?After how much time she will be able to leave medications  for dizziness completely?After how much time she will be able to leave medications  for dizziness completely? Weakness in legs and arms has reduced but still it is present