Syndoba plus doesn't seem to help.

My mom was diagnosed with atypical parkinsonium around April mid of this year. The medications started of with syndoba and around 10 days back shifted to syndoba plus. Despite taking medicines her condition seems to be deteriorating. What she could do 2-3 weeks back with ease, she is finding it very difficult now. She can't even get up from the sofa and chair without the support of both hands. Even the amount of time she could walk continuously is decreasing slowly. She feels her legs have no strength and they are buckling down. The bent neck and spinal mri came out clean... Both the paraneoplastic test and autoimmune encephalitis mosaic tests came out negative...is this kind of deterioration normal for atypical parkinsonium cases in just a few days? They had told us we could see improvement in 2 weeks once we started with syndoba plus but her condition is going down instead of atleast stabilising...what should be our next steps?