Exactly, Jade's Fire! And Mara's decision to give up the ship didn't come from Luke. She hid it from him until it was too late. And since she was surprised when she could hear the Qom Jha she obviously wasn't thinking, "Oh goodie, this will make me a Jedi Knight." She crashed the ship into the Hand of Thrawn because it was the best way to keep Parck and Fel from contacting the Imperial Remnant. That was her only concern at the time.