Bruh, my favourability would be dropping too if I saw an intruder. She knows she's not meant to be there. The "right" thing to do would just be to sit tight and wait at his office.
It's not that weird. You don't just wander off and explore when you're a guest, that's rid af.
I bet the kids will end up coming to her rescue by saying she helped them. The only way out in this case is to just tell the truth. I came to the office, you weren't there, but I saw this doorway open and thought you might be there sorry for intruding. Tadah