Dear friends,
For a while, let us set aside the specifics - a lady employee, maternity leave, etc. Let us discuss, for that matter, any employee, whether male or female, can claim back the same job when resuming duty after the expiry of leave (whether it be ML/SL or EL/PL). It's common practice in almost all offices, whether private or public, that a void created by an employee going on leave has to be filled by someone, either by reallocating duties or by hiring a new employee. It is at the discretion of the establishment either to allow the new recruit to continue in the same position or to ask them to leave once the term ends. The employee who took the leave has the right to resume duty in the establishment without any reduction in service conditions, pay, or status. However, there cannot be an automatic right to the same post and duties. If such a demand is made, it could lead to controversy as similar demands can be raised by new staff (unless they were hired specifically for the duration of the leave vacancy, in which case their term ends once the original employee returns to duty). This system is prevalent in government setups where the Manpower plan includes creating normal vacancies plus a certain percentage/number as leave vacancies. I have observed in some offices that existing staff members, in rotation, used to apply for leave one after the other, almost like a relay race, with the intention of artificially creating a leave vacancy to assist the 'Recruit-in-leave-vacancy' in making a living. Such individuals, acting as 'all-rounders,' end up performing a variety of roles in the same office, continuing for many years. The only difference in this scenario is in designation, pay, and permanency. In private companies as well, there are contract staff who may be engaged on a day-to-day basis, including in offices, administration, technical areas, housekeeping, services, utilities, etc. Therefore, it is natural for one to feel aggrieved upon resuming duties, but they should also consider the predicament of the Heads of Departments (HODs) who are compelled to ensure all tasks are completed without any interruptions, and they cannot make excuses for the absence of someone who has been on leave. In my opinion, similar to what many others have pointed out, there may not be a concrete legal remedy to pursue rather than compromising on certain issues and regaining the trust of the office and colleagues by meeting expectations through proficiently executing new assignments, even if it involves sacrificing personal convenience. While the concerned individual has not committed any crime, it is essential to take things with a pinch of salt too.
I hope this revised version captures the essence of your original message while addressing spelling, grammar, and paragraph formatting.