She pauses to think of how to explain it, and promptly loses her ability to do anything involving that many words. She continues anyway, gently stretching out her back and limbs while she explains.
What she needs is, put simply, an opening; in practice what that means is her master alone, distracted, away from the other apprentices, in the right part of the compound for her to get to his quarters afterward to get the spaceship passkeys - and, she needs to be in good enough mental shape herself to challenge him; she's deceiving him right now by being in the habit of acting more impaired than she is, which means she won't slip up and wreck the whole thing, but also means that most of the time, even if there is an opening, she can't take advantage of it, because she can't trust herself to recognize that it is a good time to break those habits.
It'll come together eventually, but if he helps her, it will be much faster. Letting him pilot her is less effort than making decisions about how to act, when she's having a bad day; the more she can rest on bad days, the more common good days will be. And if he takes to piloting fighting well enough, they might not even need to wait for a good day at all.