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Faster and legit way to win the battle. Using only lore and tactic from the game, not bugging teleport her while chating.
1. Make it rain in all of it's field, while hide or down the cliff, she will not engage you by don't see where you are.
2. Water will create a smoke field, reducing her capability to instant spot your team
3. Make a water surface for your party be on.
4. Try to sneak your teleport close enough to be able to teleport her down the clif
5 Battle time:
5.1 Bless the water surface your team is on (this will reduces the pain.
5.1 Teleport her down the cliff, she will engage battle and spawn her totens and possibly put the pain on you.
5.2 Kill all her totens while she tries to get you the hill
5.3 Go doing water/holy damage as she approach
5.4 Manage to buff up your party when she comes
5.5 Now is the usual fight strategy; hit before getting beaten :)
6. Profit :)
Left her for later when the team was level 16, put Ifan with the main character (mage) on the highest ledge in the nearby ruins, let Beast and Sebille hack it out in the flames. Started the fight with Ifan's shot. Only lost Ifan because she briefly possessed my mage. Not the hardest fight this way =)
Saved her for last. Currently level 17 with Lonewolf. Intelegence 60 with Aero at 22. Cast thunderstorm and she died in two turns.