Why so dumb all of the sudden (ch 108)

So, let me get this straight. They have a very delicate mission, with only one chance to succeed, cause otherwise emperor would hide his tracks and accuse them all of treason. The last time she was snooping in the area, she was already found out by that head magician, so she knows it’s not save to appear there again - it’s like screaming “hey, I know something!”. The plan is due THIS day. She is literally to meet with ML in like hours or minutes. They already have their location set, so the best thing they can do is lay low, so that no one catches on that the crown prince is aware of emperor’s plan and that FL is working for him. And despite ALL OF THE ABOVE she goes “lemme just check that room real quick to see if nothing changed”? GIRL your appearance there is a thing, that may raise suspicion and cause them to change their plans. Where the fuck did she leave her brain? The story was progressing so well, why is she suddenly acting so dumb and out of character?