Correct me if I'm wrong, but didn't that "omniversal" Chaos Wave happened right after she said "No more mutants". If so,
this might be proof enough. Jaspers seems to have been reborn before she said that and before Chaos Wave emerged from Earth-616, and right here on this scan it says that omniverse was swept by a temporal wave and that it re-arranged the whole omniverse.
Also, I've sent that scan where the official Marvel website treated House of M as an omniversal warp, since it said that Wanda re-imagined the entire Marvel Universe (notice that "Universe" is in uppercase letter, and they never use that, unless they mean the entirety of Marvel, aka omniverse.)
Plus, there's that scan about Beast/Hank McCoy, that @Shivansh sent, and him speaking about that warp being omniversal.
Also, we have
this, Doctor Doom, who had the chance to experience the power of the Beyonder, said that Life Force, which possessed the Scarlet Witch during House of M, was more powerful than Beyonder.
And the last
one is more related to Chthon, who gave Scarlet Witch her powers. Now, what's interesting about this one is that it's stated that Chthon lives outside of space and time, just like Mr. Mxyzptlk does, and he has a rating "High 2-A". We never really found out how much of Chthon's powers was given to Scarlet Witch, and there's no upper limit, therefore, it's quite possible that her warp was at least worthy of "2-A" rating, if not higher.