Well the thing about Wanda's powers is that it doesn't really matter who's powerful and who's not. Even in her classic days before she reached anywhere near the ridiculous level she's at these days, her power has been kinda hax.
Probability manipulation is not like magic. It doesn't care about power levels or cosmic hierarchy or anything of the sort. A relatively inexperienced Wanda owned the crap out of an uber powerful Dormammu by altering the probability his ritual with the Evil Eye would backfire on him.
In that sense, her power really bypasses the fact that Dormammu is above most skyfathers, or Amethyst is a Lord of Order, as she's not really targeting people specifically - she's targeting the Probability of events happening to those people.