My mistake. It's Cosp'r'ayers. The lead gal (Scarlet?) does the transformation thing ('Charm up!'

and becomes a Superheroine Nun.
It's pretty bad, but in an entertaning kind of way... that's the advantage of 'cute girl' shows as opposed to mecha or period pieces... if the series stinks, you can still ogle.
O_O - ~_O - ^_^