The thing about Miss Piggy is that she kind of has a Roger Rabbit comedy superpower where she wins nearly any conceivable fight she's in. But unlike other characters of which that's true, like say, Bugs Bunny, who tend to win because they make the opponent play the game with their rules, Miss Piggy wins because the joke is that she can beat the shit out of literally anybody.
Bugs Bunny beats Thanos by setting up an airport and making him take off the Infinity Gauntlet to go through the metal detector.
Miss Piggy beats Thanos by karate chopping him in the face and sending him flying.
