It's hard enough just being a new Queen of the Changelings: teaching the Hive new ways to live, dealing with pony politics and plundervines, staging a musical... Try doing all that while also trying to put the old, hated Queen back on the throne
Cabbage Patch is a Changeling who just wishes to live as a pony, to forget about her past and live a somewhat normal life traveling and performing with Trixie's Thespians. Fate, and a certain Princess, have other plans for her though.