CHATTER IN MIND

i have a question,my mother who is 87 years old,living by herself widowed since 57,generally in good health,mildly immobile since a year,had suffered a transient ischemic attack in november 2009 as shown by mri,since recovered.
however since last one month she has been calling out repeatedly lying on her bed to the servants ' hey bai' like chanting day and night,without getting tired.neurologist has prescribed her ativan 1mg and quitapin .25mg at night; when she sleeps.
but the day all hell breaks lose.is this dementia,how could i stop or control this chanting.
my old servants r threatening to leave the job.
what mild/stronger day time tranquiliser would u reccomend to quiet her chatter.
r her symptoms indicative of vascular dementia.
which drug could calm her chatter she being 87 yrs old
antisychotics,mood stabilisers,serotoninn affecting drugs,stimulamts like methylphenidate,or
drugs which slow the rate of symtom worsening ie.aricept (donepezil),exelon (rivastigmine),memantine (namenda),razadyne(gelantamine