Bc reservation rule

If she belongs to BC community of Punjab state also then the government's action to deny her the opportunity can be challenged in the high court by filing a writ petition.

You may consult an advocate in the local and proceed as suggested 

The State Governments make the reservation rules according to their state. Some castes are BCs and the state of Punjab state also has the same caste community it will provide. If your caste is in Punjab and not allowed, you can seek redress from a court of law.

It is a State subject.

However, government cannot deny benefit of reservation on the basis of marriage of a person. Challange it.

Here are some key facts regarding BC category reservations in Punjab. 

1. The punjab govt. increased the BC category reservation from 5% to 10% for admissions in educational institutions and professional programs. 
2. Jats and Jat sikhs are considered BCs in PUnjab. 
3. the Punjab govt. gives 25% of public employment positions to S.C. category  and 12% TO OBCs, totalling 37% reservation. 
4. the NCBC has proposed increasing the OBC quota by 13% bringing the total OBC reservation in public employment to 25%