It was fun watching woman-child Krustina be passed around between Sonny, Michael and Alexis. Presently, Krustina is the worst character on the show. NO redeeming qualities. How exactly will it help your mother if you tell Anna that you drove your car to the Q's that night? It won't. How would it help your father? It won't. And um, if Krustina had Alexis' car--how did Alexis get to the bridge???
Kristina took Alexis car, went to Sonny's, took the gun and then went the cemetery and the Q's mansion before returning to Alexis house. That's when Alexis then saw the gun in Kristina's bag. She then took said car to the bridge to toss the gun.