She has no way to develop because her foils have been written out of the show:
-Ludo, showing that with hard work even a little muppet can do great things;
-Toffee, the only grounded character in a silly little sitcom
-Eclipsa, who dindu nuffin despite being set up as the logical end-result of who Star would be without learning responsibility
SVTFOE is a show with neither antagonists nor plot beyond ephemeral ideas like Seth, which renders its progression moot. Compare it to Steven Universe, which took YEARS just to develop the single plot point that Pink Diamond is really dead and Steven is his own character.