I'm not sure if this should go in Reference, or Plot Help, so...feel free to move it.
Okay, I'm writing a DH-era story, and one of my characters isn't really sure of ancestry, since she found out her mother's not really her mother. Now they're really not sure of her ancestry, whether witch or muggle, and they're not in contact with her mother (the one she was raised with). So it's set in Harry's seventh year, with Snape ruling the school. The girl is in Ravenclaw, btw, if that makes anything clearer.
I kinda had this vision of Dolores Umbridge using pain to find out who Oliva's (my character, OC) mother is. Is this inaccurate? How do they find out parents in the Wizarding World? [Spoiler](BTW, her mom's a muggle, and her birth mother's a muggle too; actually, her prissy aunt) [Spoiler]
Any help would be appreciated!