You hear movement, do you have knowledge nature or the d20 equivalent?
Just Physical Sciences, which is probably a stretch. That being said, she
can make untrained Knowledge checks for anything DC 10 or lower (so, common knowledge).
Knowledge (Nature) - untrained = 1d20+4
Rolled 1d20+4 : 4 + 4, total 8
Knowledge (Physical Sciences) - if applicable for any reason = 1d20+6
Rolled 1d20+6 : 6 + 6, total 12