Notwithstanding any general or special law, rule or regulation to the contrary, the teachers’ retirement board shall credit Sara Scibelli, a member of the teachers’ retirement system and an employee of the SABIS International Charter School in the city of Springfield, with creditable service for the period of August 16, 2000 to August 15, 2002, inclusive, for the purpose of determining her superannuation retirement allowance pursuant to paragraph (a) of subdivision (2) of section 5 of chapter 32 of the General Laws. Before the date that any retirement allowance becomes effective for Sara Scibelli, she shall pay into the annuity savings fund of the teachers’ retirement system in 1 sum or installments, upon such terms and conditions as the teachers’ retirement board may prescribe, an amount equal to that which would have been withheld as regular deductions from her regular compensation for such previous service, plus buyback interest, as defined in section 1 of said chapter 32.