7.5/10
I don't particularly like her, but she doesn't do anything to make me angry. She does leave the party twice, but given the system, it's never a particularly sharp penalty. She doesn't quite make the "I like this character" threshold of 8, but I feel that she's got a personality and she improves the game for being in it. So yeah, 7.5.
--
*Casts Doom on everything* You all must now feel the pain that I have felt...DIE!