Hermione’s heart clenched. She wanted to go with them, but as she looked to Bellatrix, she wondered if taking her, as she was, out of the fight was better. She didn’t know how long it would last, but if it was Time, as she suspected, if it had changed her brain along with everything else, it would make sense that that the part of the brain that held memories would have transfigured along with everything else, likely "purging’ all of her memories in the process...or at least the brain pathway to them.