She uses Overture and Entice to confuse party members to attack each other, and otherwise casts level three elemental spells. She should be taken out first, as she can quickly and easily cripple the party with Entice.
1st Turn: Entice (33%) or Thundaga (33%) or Nothing (33%)
2nd Turn: Entice (33%) or Firaga (33%) or Nothing (33%)
3rd Turn: Imp (33%) or Blizzaga (33%) or Nothing (33%)
If attacked by "Attack": Overture (100%)