Well, Marika broke the Elden Ring for starters.
Gideon’s dialogue too “Queen Marika has high hopes for us — to struggle into eternity” and some of Melina “Marika sought to test the the Golden order through chaos” support that as well.
At best I’d agree that Marika was growing more and more frustrated/rebellious towards the greater will until she finally broke the ring.
Ranni and Gideon are evil, but I would not say Marika is.