Use a +20% boost and run suicides if you can (not necessary, just makes the fight faster). You can definitely solo her … Sersi hits like a rat with no buffs. Good luck!
https://docs.google.com/spreadsheets/d/1QNtgMyepYJwJT9vYtyytf1pGB7OcnMHP8tcDIl8wkrA/edit?usp=sharing
Thanks man!