Weel, if she comes from a Royal indian family able to claim a link the Arya conquerors, racism might be overcome after 1850, because the idea of an "Aryan" race including most Europeans and many Indians was already on the air. And in the first half of the 19th century there was not that much racism towards high-caste Indians in any case.
I think that is possible IF she is Protestant Christian AND her family has a good enough of prestige, antiquity and actual strength. The "Aryan" ancestry claim might help if the cultural environment of the TL is prepared to take the Aryan myth into account.
It does not necessarily mean she has to be an Indo-Aryan language speaking, even if that would better. Many believed that high caste people in Dravidian-speaking India were Aryans as well.