When we accept that Murray has not legitimately ever won a slam, Radwanska is the female version of Murray. She is physically weak, small and lightweight, has awkward technique, and thus can never generate any real power.
She tries to counteract this by being sneaky, but tennis is not a game of strategy. It is a game of always hitting the ball cross-court. If you can hit the ball cross-court with more spin and pace than your opponent, you will beat them.