"...Nnnnnot a lot," and there's no way to keep the frustration and disillusionment out of her voice. "The marks haven't healed over, but the hallways just don't end and none of them have led to anything useful."

This ship is too big and the malevolent force that has them trapped really doesn't want them to get out.

"But I'm starting to notice I'm double-backing more often. I think that means I'm closing in on something."

Or it means she's getting closer to finding out that there isn't anything to find, but she can't think that way or she'll fall into despair.