It worried Hermione, and that probably showed, but she didn't ask questions about it. Times were getting worse for everyone, really, she didn't begrudge anyone needing to stay somewhere they felt safer. She didn't generally have a choice, she just never really thought of other DA members having to do the same thing.
Looking up the ladder, Hermione actually smiled. "I don't mind dust," she answered, and then almost started up the ladder first before she remembered herself and stepped back, letting Susan go up first.
"I should thank you again. Researching these... things. This summer. Has been so frustrating."