>>42289176
>an alicorn brought down, bound, stripped of (some of) her powers, and commanding a following from the shadows
Passing coded messages from seclusion of the monastery her sister exiled her to in an attempt to keep her away from the co-conspirators who still lurk the canterlot court.

>stripped of (some of) her powers
With her wearing a ring that limits her magic output to that of a foal.