Dear Lalith,
1. Yes if she has worked for min 80 days then she can avail the benefit. If you think on your example, you will find the answer yourself.
2. Yeas there are set rule, but it all depends on how good has been the HR with the employee, things can be worked out.
3. In case of any difficulty, such as a miscarriage, 6 weeks leave with pay at the same rate, which is as per the act.
4. Yes some companies did it, but always remember it is leave without pay. In case the employee has enough leave, she can utilise it.
I have been very short in my reply, for any other issue you can contact me at
krithika_mishra@yahoo.co.in