Notwithstanding any general or special law, rule, or regulation to the contrary, the Massachusetts Teachers’ Retirement System shall credit Abby Levin, a member of the Massachusetts’s Teachers’ Retirement System, with one year of creditable service for her work at the Northampton Center for Children and Families during the 1979-1980 school year, 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 in the case of Abby Levin, she shall pay into the annuity savings fund of the Massachusetts Teachers’ Retirement System in one (1) sum or installments, upon such terms and conditions as the 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.