Kathryn Knott gambled and lost. Wasn't convicted on all counts, but I assume she'll get a harsher sentence than the arguably "more guilty" (in a moral, not legal sense) compatriots who decided to take a plea.
Whatever I thought about the case (GUILTY!), I wasn't there and wasn't on the jury, but from what I read there was enough ambiguity that maybe she could have won that gamble. She didn't.