Radha found this article about "looking Indian." This really proves that you can't go by appearances to figure out who is Indian and who is not.
The article is about a pale, blonde girl competing in a Miss India competition in New Zealand. Though she doesn't look it, she is half Indian. Some people were shocked and upset that she was accepted into the competition and that she made it as far as she did (second runner up).
I could see having a concern that there is already a struggle to help young Indian women to know that darker skin and dark hair is beautiful. Beauty does not have to match up a European standard.
But that is a general idea to try to spread around in culture, not something to use against one young woman whose heritage is Indian even if she doesn't look it.