Five stars, but only if you're using her last click as triggered by smba020 Gwen Stacy. That way you're only paying 20 points for her, and making it very, very hard to get KO'd.

Though I have to imagine that a 13-attack, 6-damage charge/flurry with Super Strength PLUS a -1 attack and -1 damage will make it highly likely that your opponent puts in some extra effort for 30 points.