The first explanation I hear her give is “I thought you were on Ace high,” which when asked “So why call with Jack high then?” she immediately changes the subject. Eventually she states that she was playing him as opposed to playing poker, which is a much more plausible thing to say.
Given that her initial justification didn’t make any sense, I genuinely just think she won by making a bad decision. It’s a perfectly valid thing to do in poker, but I can understand the argument for why she could have been cheating.