Use Carbuncle. If the whole party has Reflect on she will use three turns casting Dispel on each person, by that time you can summon Carbuncle again. Use Leviathan's Recover to heal when you have Reflect active as Recover penetrates it. Don't forget to Draw Alexander from Edea. Beware of her Maelstrom attack as it pierces Reflect and hurts a lot, as well as inflicting Curse (prevents you from using limit breaks).