>>510954092correct
plus if she genuinely does not know because she is an oblivious girl brought up by NPCs just ask what her grandfather did in WW2 plus the whole family, this usually leaves 3 options, either "he fought for germany, he fled from the germans or he was a traitor"
this is only possible in germany though
personally, my and my wifes grandparents, still have our Ariernachweis (=certificate of being aryan, issued in natsoc germany)
many families do not have these almost 100 year old documents anymore but you can nstill just talk and ask. as russian anon also said, it makes them (the jews) go crazy to ask them about being jewish. its unthinkable a jewess will lie to you in THIS matter