Your mother as a legal heir is entitled to following claims:
1. If the firm is covered under Gratuity Act, that if, there were 10 or more employees at any time ( which woulod be of course if it is covered under EPF Act on statutory basis), then to the gratuity @ 15 days per year of service to be calculated as Basic Pay +DA/26*15*50.
2. EPF accumulations of your deceased father from EPF Office
3. Pension under EPS
4. EDLI payment
5. Unpaid wages of your father, if any, from the employer
6. Leave encashment, if any
7. Bonus amount if admissible
If the death of your father is not attributable to employment but as in the ordinary course, then she is not entitled to compensation under Employees Compensation Act.
In case the document formalities to claim EPF and Pension & EDLI is required, pls. let me know. I shall mention the same.