Well I don't think she's to far from being slow, I haven't seen her brain winning any races, during all of this.
JMO...Billie has never struck me as slow or of below average intelligence. Out of the gate, from the start of her many taped appearances, she has always struck me as at least of average or higher intelligence. She made N Grace "work" during one of her several appearances on her show before she gave Grace a straight answer.
Billie continues to strike me as bold, unafraid to twist, dance, and weave in front of the camera, to reporters, to LE, etc. IMO, she's a seasoned manipulator. I don't believe this is a new skill recently acquired by Billie.