So like... is she not gonna question the horn? Girl's got her priorities in some kind of way if she falls in love with the first guy she sees (who also has a horn) after waking up in an unknown location
Well, she already saw a bunch of weird stuff such as Lilith's ears and... Hooty. So one more anomaly isn't that much of a difference probably. Also, if you're taken away by someone's beauty, you easily blend out less important stuff.