There are millions of Indian guys online doing whatever they can to get a foreign wife/girlfriend. India has a caste system and a guy there would more or less have marry a woman of similar social status, often with the wedding being arranged. They don't get their choice of women in India. If he marries the old American lady he gets one step closer to moving to the USA as the spouse of an American. Also, her $1200 a month in social security may be 3-4 times what he earns in a month. Also, he thinks she's richer than she is and would assume she has way more than $6,000. He ain't gonna be happy when her money runs out in a year.
I think she said that he bought her the plane ticket. That would really, really surprise me. I have a hard time believing it's true.
What I missed is why she's moving to India instead if importing him to the USA. Maybe like Paul, she's too poor to sponsor him and can't get a co-sponsor, but I don't remember that being discussed as her motivation for moving there.