Satele blasts extremely durable droids apart with a gesture, and crushes them into balls. She blasts blast doors apart casually. All of these showings have been her not trying, Satele actually trying was her forming a neigh impenetrable force shield around her in space, but even that didn't seem to be hard for her
That she's more powerful than Satele? I didn't know that even needed to be proven. That Satele can't get through her defenses? Vitiate couldn't, despite still being capable of tearing down the Dark Temple.
She is able to ragdoll Vitiate after his defeat. Plus slap back Vitiate-possessing-Kira without gesturing. Rip car-sized rocks out of the ceiling. Mind-fvck Tol Braga. And use some unknown stun technique on some troopers.
Satele herself stated that the Hero was the Jedi's best hope for victory against the Empire. That seems like a clear admission that the Hero's power exceeds Satele's.
True, Jedi are often humble about such things, but when the entire galaxy is at stake I think she would make very sure that the person she believes to be more powerful is indeed that.