Harassment ,Intimidation,wrong demands -from Sr. citizen,widow

Sirs, My Mother is owning a tenement in the housing society since 1968; She is now 77 yrs old, and a Widow, since 1989. The society office bearers filed a court case in 1989 against her, demanding "dues" of so called "unpaid house construction bills+ compounded interest on the same(A)" related to 1970. The case has in the board of nominees court. She fought the case, the society could not produce any proof of their demands( including the principal amount), and the case was "filed, and discharged" by the court, around 2001. Now the society has been demanding the same "A" , indirectly in their annual reports, showing as " debit" against her name in the society's balance sheet; Further she has now received a registered letter by the Seceretary threatening "stern action" in this matter; further the amount is shown as > 4 lacs Rs,( while the original principal sum claimed in 1970 was 2750 Rs.); in the intervening years she has been denied rightful benefits like; Registration of Nomination; Permission for 2nd floor construction from Society; etc. I request your advise to counter this matter; Can she file a harasment case in police station against the office bearers of the society? the same person has been the seceretary of the society for last 25+ years!