If it's the Jx vs. 8c7c on TTc9cx board hand you're talking about, then yes she was ahead when she called the all-in. No-one would care if she just donked off her chips. It's the fact she called an all-in with J high AND it happening to be the best hand at the time, and having like 53% equity or something, that made people sit up and take notice.
I'm open to the idea that she cheated, but I'm more inclined to think she's just bad at poker.
Mike Postle was a much more open-and-shut case, as his cheating was so obvious. If Robbie whatsername was cheating, and trying not to get caught, why pick a hand that's going to make everyone do a double-take, and bring a lot of scrutiny onto yourself? Seems you'd want to be a lot more subtle about it, pick an odd spot here and there, where your play actually makes sense, then do it.
Also, she gave Garrett his money back after the hand. Seems like a weird thing to do if you're trying to look innocent. Either that or it's some 3D chess thing - but we all know how easy it is to ascribe 3D chess skills to someone who's just a lucky idiot lol.
Vibrating chairs is a poor theory imo. What, someone installed a vibrator in her chair when no-one was looking? Rigggght. Or, she had beads up her ass that vibrated so powerfully that it shook the chair? Goddamn, if that's true you should have at least seen it on her face that she was getting remotely plowed up the ass while the game was on. "Oh baby, ooooh baby, that's it yeahhhh...I call."