How do you not know if you paid for something like a polygraph? A co-worker buying you a coffee a few months ago and not being sure if it was Tuesday or Thursday, sure, but a f*^%ing polygraph!?
Meh. She’s in the middle of an all-expense-paid trip. Payment is likely not at the top of her focus.
That said, her inability to remember whether she’d given the reporter a copy of her medical records was something more directly on point, and her forgetting that seems problematic.