Maybe spontaneous cure and restoration (greater/lesser/all of them). Restoration seems to cover a lot more of the "classic healing" you imagine from this type of character. Less a healing of physical wounds, more a healing of the soul (or something cheesy like that).
Soul healing?

Hahahaha. Ha. Ha. I'm assuming you're not familiar with the source material, Puella Magi Madoka Magica? To sum it up, their souls corrupt over time intrinsically and it is not at all an idealized representation of Magical Girls.

Actually, maybe a good set of spells would be the cleric list plus one or two sorcerer/wizard schools (evocation and transmutakon, probably). That seems like it would cover most normal powers with some variety. Maybe just say "cleric list plus two sorcerer/wizard schools, chosen a character creation."
Ooh, now THAT'S a good idea.

The problem is, saying that they get anything more than one major class' spell list immediately bumps the class up to a point far above sorcerer. Sure, sorcerer sucks, but that's the type of thing DMs don't like: classes that clearly outshine others.
Indeed; but its class features already made it better than the Sorcerer atleast somewhat; the point of the class is to burn brightly, but burn out quick; characters with this class are trading for huge power gains at the price of damnation.