Feelings were weaknesses. That had been one of her first lessons. She was just as brainwashed as the rest of them even if she knew it. That's why she had to run. Living in that environment any longer would've ripped out the last shred of humanity that made her Hermione. She'd already had to commit crimes and atrocities that were disgusting to her palate. And not all of them were even illegal or immoral. Running gave her a hope, even if it was just a sliver, that maybe she could find herself again. Be normal again.