My granny have parkinson

Hello Dear, My granny diagnosed parkinson before 12 years, now she is 76 on start she have mild symptoms, little shakes of right hand and leg, after she start with therapy she not shakes anymore but she have problem like from nowhere she can't move she say he feel like she have weights on his legs, she say this happend because she forget to take pill, usualy she walk normal, she not shakes, i noticed last 1month she behave little strange like little hyperactive, doctor say this is because of a lot pills, im scared does he have lose mind of all this pills? doctor say if he reduce dose symptoms like shakes, braking will back, anyone please help, i think about cbd oil? Thank you.