Marriage

you file a complaint against suspense person in near police police station and police search your partner .

Dear Sir, You may file missing complaint with police and they may trace out her address.

If she chooses to go along with her parents court will let her along with her parents

marriage under special marriage act and protection from high court is what you need

If you want to know the status of your girlfriend, then you can take the police with you to the house of your girlfriend. even if you are not able to know the whereabouts of your girlfriend, then you can file a writ petition in the High Court. yes, as you both are major you both can marry under a special marriage act.

You may marry her as per the Indian Marriage Act.