If you assume that the witch domain work under maths, the hierarchy would go to High 1-B. Then, you get Featherine domain that is inaccessible to it, no matter how high the witch domain can go. (Let's ignore the R>F for the comparison I'm making).
Now, what makes Featherine domain, in the situation I've stated, to be anything more than an inaccessible cardinal? Would you say it's above maths merely because the witch domain (High 1-B hierarchy/aleph) can't reach her?
If the whole genus doesn't change (that's the case in this example but it's the same in the actual situation), it means that it's still confined/encompassed by said Genus. It's not because Featherine has a "bigger" gap, be it mathematical or metaphysical, than the things below her that it enough for High 1-A.
A way to achieve High 1-A for Featherine, in my understanding at least, would be to say that she isn't "inaccessible" to lower layers of reality, but that she transcend the very genus of "layers of reality" and that she operate on something much higher.