When Harry mentioned going back to Godric's Hollow in an attempt to find the Sword of Gryffindor and for more information, she agreed. And when they arrived and were invited by Bathilda Bagshot, she wasn’t suspicious enough. Trapped between the emotions as she stood with Harry at the grave of his parents, the hope that they were finally making progress again and trying to find a way to ask Bathilda to sign her copy of A History of Magic, Hermione walked straight into Voldemort’s trap. Dragging Harry with her.