It is due to those Indian women not having the opportunity to earn money. If you look at American women who are children of Indian immigrants, the rate is much higher, because women have a far easier time obtaining higher income jobs in the US (or UK/Aus/Can/other developed countries).
But that is rapidly changing amongst the upper classes in India too, almost everyone will support their daughter to get as good of an education as they can and secure as good income earning opportunities as they can.
28% of Indian students are enrolled in higher education. The gender split is 52:48 in favor of males.[1] For the US those numbers are 39% and 45:55 (more women than men).[2] Since they're from different sources the participation rates might not be directly comparable shrug but the gender stats should still be applicable.
At least going by that, there doesn't appear to be a great deal of "lock your girls and women away" going on over in India.
But that is rapidly changing amongst the upper classes in India too, almost everyone will support their daughter to get as good of an education as they can and secure as good income earning opportunities as they can.