Is there any hope that doubling Mom's Alzheimer's medication will reverse her dramatic decline?

My mother has been in the early stages of Alzheimer's for several years. About 3 years ago,she went to the doctor; received some sample meds which affected her adversely with physical symptoms she didn't like. She simply threw them away and refused to go the doctor again. Within the past 12 months her symptoms had accelerated dramatically, but was still in early mid stage. She finally consented to go back to the doctor; received a different prescription and was doing fine. About 3 weeks ago, she began taking a refill that was double the dose of what she was on. Her dementia became dramatically worse, to where I now classify her in stage 5. The doctor's office and I played phone tag for several days. Meantime, I cut her dose back to once a day instead of the prescribed twice a day. The doctor has now put her back on the dose she was on before. My question is Is there any hope that her dramatic decline will reverse to where her dementia was before taking the doubled strength?