Since there's not much she can do worrying about it here, Rey just waves her hand dismissively at Firo's apology.

"No worries, I hate being in small spaces anyway." You wouldn't think it, but she's extremely claustrophobic. "Surprised that I'm even back, to be honest. Almost suffocated to death in that undercarriage."

Climbing into the landing gear of an aircraft totally made sense to her at the time.