Unless your daughter is somehow concealing her South Asian heritage in her applications (which would be tough to do unless she doesn’t appear South Asian, has a name that is not South Asian, and doesn’t have parents who were educated in India), I would only think that it would be an advantage to add her facility with Hindi to her application.
I really don’t think that any college would look at her and say that she is as less-desirable candidate because she’s South Asian as opposed to White, or because she’s fluent in Hindi. I think it can only help.