How do I find a missing person?

My friend [over 60] goes to India a lot, eventually she found and got engaged to a man. She along with him, who has a shop selling all kinds of nick-knacks, was setting up a school there, cant remember exactly where about though. Think this was being financed by her too. Well' it'll be three years this September she was going back out to do this. I haven't heard from her since. We are very close and have in the past kept in touch every week, now I can't find her at all. She doesn't answer her phone or mobile. I can't find any of her family. She is a wealthy woman which makes me fear for her safety. The local police near her wouldn't even go and bang on her door, saying she's an older woman so can come and go as she pleases. I'm really worried but don't know how to go about trying to find her. Any help with this would be much appreciated.

Thanks in advance.