She's not much different from her blue tome self. I had a -atk one for a while, and she was still able to blitz enemies down with LnD, Desperation, and partners to horse buff her.
At least she's not -Spd. Bladetome users are least affected by -Atk banes and she's got a better bladetome since it has more mt. Keep her in horse team with full cavalry buffs to be most effective.