Not sure about Baccara yet, but for comparison, Ghost Weed has a little bit of everything, so I can see why she's SS.

http://flowerknight.wikia.com/wiki/Ghost_Weed

During combat, increase party members' attack power by 15%, and increase their skill trigger chance by up to 1.2x depending on their affection value.

During combat, increases the effectiveness of Solar Drive by 70%
Upon being attacked, counterattack 80% of the time dealing damage equal to 2.2x of her defense.