Dear Friend Anish,
It's very wise that she did not give a backdated resignation but instead asked the employer to issue a termination letter, and I think they will not dare to do so. I suggest you inform the employer that, due to a specific reason (unable to join duty, accompanied by a doctor's certificate stating she's pregnant), she will be on leave and will only resume duty after (as per MB). Keep the conversation in writing, especially through email, as proof.
Under Section 12 of the M.B. Act, 1961, it is emphasized that any dismissal or discharge of a woman during pregnancy is unlawful, and such employers can be punished under Section 21 of the Act. Furthermore, I suggest filing a written complaint with the Labour Commissioner of the respective region against the employer along with valid proof.
Please refer to the Q&A below:
Q: How can a woman employee claim her maternity benefit?
A: A woman employed in an establishment and entitled to maternity benefits under this Act must give written notice to her employer stating her claim for maternity benefits. The amount she may be entitled to under the Act can be paid to her or her nominee. The pregnant woman must state the date from which she will be absent from work, which cannot be earlier than six weeks from the expected delivery date. If the woman did not give notice during pregnancy, she may do so as soon as possible after delivery. Upon receipt of the notice, the employer must permit the woman to be absent from work during the period for which she receives maternity benefits.
Q: What is the provision relating to the prohibition of dismissal for a woman employee during absence due to pregnancy?
A: It is unlawful for an employer to discharge or dismiss a woman who is absent from work in accordance with the Maternity Benefit Act. A notice of discharge or dismissal that would disadvantage the woman in terms of her conditions of service is also unlawful. Dismissal or discharge is permissible only in cases of prescribed gross misconduct, for which the employer must inform the woman in writing that she will be deprived of maternity benefits, medical bonus, or both. The woman, if notified within sixty days of such an order, can appeal to the prescribed authority. The decision of that authority on the appeal will be final.
Q: What are the provisions for punishment or penalty for an employer who contravenes these laws?
A: An employer who fails to pay any maternity benefit to a woman entitled under this Act or discharges or dismisses such woman during or on account of her absence from work as per this Act shall be punishable with imprisonment up to 1 year, a fine up to Rs. 5000, or both.
Hope this information is helpful for you.