Interesting enough a LOT of folks have asked that not just with her but other mutants who are doing little of nothing in X-books and are not appearing anywhere else.
If she is that big why is she not in other books? X-Office won't let them.
She is NOT Wakandan. She has no claim. Marriage annulled."Why X-Men’s Storm Is the Rightful Ruler of Wakanda"
As big as T'Challa's family is there are too many relative who should have a stake in that throne.
And how can she be on a Throne that doesn't exist thanks to Coates.
And even if we got that book-how many issues would it last? 6 and axed at issue 2?