Is it just me being daft or is she a lot harder than Navarre and Robin?
I went through quite a few team makeups before making it work with Soleil, Olivia, YT!Olivia and Azura. I had to switch my +10 Soleil to Blazing Wind and giving her Def Tactic seal to allow my YT!Olivia with Bracing Stance and Distant Defence to block the armor axe and top dagger unit with WoM letting her flee to Soleil afterwards. With 3 dances, Soleil took out the four at the bottom in 1 turn, YT!Olivia doing her blocking then all 4 running until Wrath charged Soleil's Blazing Wind again so she and Olivia (attacking, not dancing) could take out the armor axe then Soleil could be danced to kill the dagger.
I'm proud of my Olivias, together, though mostly the 4*+9 normal variant with Wo Dao/Moonbow, they took the armor axe down to 20-odd HP letting Soleil and her 1HP safely kill it. Who says you shouldn't build dancers for combat.