I think this is an interesting point. If were assessing her skills based on the content of her lies, then, I'd say no, she's not particularly good at it. they tend to be too elaborate, too detailed, especially when she's forced to come up with them on short notice. But I give her credit (not sure that's exactly the right phrase) for being able to stay calm and manipulate the vunerabilities of people who are not habitual liars. Most people, when confronted with a lie, will get agitated and defensive, or simply break down and tell the truth, but Casey calmly maintains that she is telling the truth, even when the lie is obvious. Because she doesn't act like we expect people to act, it creates a conflict in our brains. Since our brains do not like conflict, we either ignore the fact that they are lying, or worse, sometimes start to doubt ourselves (see gaslighting) or we decide to confront them about their lie. The second option, confrontation, is usually uncomfortable,frustrating and exhausting because the liar is generally not going to back down from their position, most of us only do choose to confront them if the effort outweighs the benefit. In that sense, Casey does have a "skill" MOO
Okay, she gets "some" for being able to stay calm while lying.