Try sorting your inventory? The battle item order is different to the menu item order, IIRC.

If you have it, cast Meltdown at the start of the battle.

Have one character doing nothing but healing, via either magic, items or abilities. Remember to cast Double/Triple/Cerberus on them ASAP. Heal even if it seems like you don't need to. Use your other character to revive KOed allies if they die.

I can't remember if Adel is one of those sorceresses who zaps your GFs as soon as you try to use them, but if she is, don't be afraid to sacrifice one to distract her in a pinch.