No...I don't think it was just to save Momota-chan. I didn't understand what she was asking, but it was obvious she suddenly knew something that I didn't. And whatever it was, I think that's partially what drove her to come attack me. The mastermind must have done something...maybe left another flashback light.

[It's the only thing that makes sense. Yes, she'd want to save Kaito, but if that was the only reason there wouldn't have been any point in torturing him for information he didn't have.]

By using an electrohammer I'm guessing. It probably knocked out whatever was locking the cockpits for those things, which would let her get inside. Other than that, I don't have any clue.