Well, if we're going with the high-end feats for Honkai, then I guess it isn't a stomp in terms of firepower.
Of the feats I listed, I guess the "universe-level" bracket begins with the Current Era's Herrscher of Dominance, which is much weaker than characters like Mei (Herrscher of Thunder), Kiana (Herrscher of Flamescion), and Durandal (Platinus Equinox). Mei, prior to her current training arc, shrugged away the Herrscher of Dominance's attempt "steal" her Herrscher powers specifically because it was too weak to do so, and this version of Mei is much weaker than some other characters, most notably the 13 Flame-Chasers, who have tiers among even their ranks. So there are a few tiers above the Herrscher of Dominance, so the White Queen may be at a disadvantage there.
Blocking attacks that tear through space-time is tricky, but it can be done since characters (most notably Herrschers) have blocked attacks that act through sub-space, which, I guess means that they are intangible or something. It's never made clear what. Other characters have also shown the ability to tear through space and reality warp.
With that said, however:
If this applies to her attack speed and reactions, then she should be able to clean up Honkai 1v1 without much issue, I think. Even their best speed feats don't reach that level. While characters have traveled across the multiverse before, the universes from the perspective of people residing outside of them are small, so there's nothing suggesting that they can fly at massively faster than light speeds that would come close to Plank-second timeframes. Furthermore, the attack where they spam billions of attacks would be annoying to deal with, and no character has shown the ability to dealing with billions of attacks, though many have shown large area-of-effect attacks