Dear friend, welcome to HCM.
did she ever have fever, chills?
are knees painful, reddened?
well it is difficult to tell from here for sure,
I think of possibility of a brain disorder like stroke or septic encephalopathy
, if there is fever/ knee infection
I would advise you to see a neurologist
to evaluate her confusion, amnesia
, slurred speech. she probably needs admission and investigations. it coluld get worse.
take care and pl. keep me posted on your progress.