DOJ; Date of Joining
LWD: Last Working Day
Depending upon what is this establishment e.g Local Body she may be eligible from DOJ or from 1982 or from 1997…………………to LWD.
Inquire locally about it.
Get details of applicable Gratuity Rules from some old staff, or office or Univ, or thru RTI or from some local counsel (senior) specializing in Labor/Service matters and handling Gratuity Matters.
I am sending two links that you may go thru, carefully.
You can download FornI also from these links.