She can file for divorce in Chennai or Mumbai for followin reason: -
1. Marriage performed in Mumbai, hence Mumbai has jurisdiction.
2. They las stayed together in Mumbai, hence Mumbai has jurisdiction.
3. The girl is now residing in chennai, hence Chennai has jurisdicition.
HYDERABAD BY NO WAY HAS JURISDICTION TO ENTERTAIN THE ANNULMENT PETITION.
The Annulment petittion shall be filed u/s 12(1)(a) of the Hindu Marriage Act.