With the first few steps, it didn't look like there was anything problematic.  No traps or obvious trigger mechanisms or anything like that.  But this was only the first few steps.  It looked like the tunnel into the back had a ways to go.  The good news was, there didn't seem to be any traps...not until she was<em>right</em>at the threshold of the cache entrance.  She managed to spot it easily.  She just needed to get past it, and then find the trigger mechanism.