I’m not sure what happened here, but if I had to guess (in order of likelihood, not all are mutually exclusive):
Bad joke (accident)
Got flustered, said the first thing that popped into her head
Bad joke (on purpose)
Flirting
Was actually watching porn, and thought that coming clean would in some way be better, or that saying the truth but in a weird way would mask the truth
Wanted to get fired but didn’t want to quit, somehow this was more socially acceptable than quitting
She was telling him “None of your business!” in an intentionally rude way. He walked in, she obviously snapped her computer shut. Then he asked what she was intentionally keeping from him. I think its plausible she was saying “I snapped the computer shut because it is private. Why would you ask after something when I signalled so clearly it was private. Do you really expect me to just tell you the answer immediately after making it clear you are not supposed to know?” This means it could be her doing work of her own that is private (eg. she does digital art in some weird sub-community and doesn’t want the “hey, that image is cool what is it?” discussion.)
I’m not sure what happened here, but if I had to guess (in order of likelihood, not all are mutually exclusive):
Bad joke (accident)
Got flustered, said the first thing that popped into her head
Bad joke (on purpose)
Flirting
Was actually watching porn, and thought that coming clean would in some way be better, or that saying the truth but in a weird way would mask the truth
Wanted to get fired but didn’t want to quit, somehow this was more socially acceptable than quitting
I think an important theory is missing here:
She was telling him “None of your business!” in an intentionally rude way. He walked in, she obviously snapped her computer shut. Then he asked what she was intentionally keeping from him. I think its plausible she was saying “I snapped the computer shut because it is private. Why would you ask after something when I signalled so clearly it was private. Do you really expect me to just tell you the answer immediately after making it clear you are not supposed to know?” This means it could be her doing work of her own that is private (eg. she does digital art in some weird sub-community and doesn’t want the “hey, that image is cool what is it?” discussion.)
Another theory is she thought she had been hired for performing another service entirely and this was her way of breaking the ice.
I’m missing “is deeply committed to saying the truth in all circumstances” from your list. Seems at least possible, right?