Honestly just train a bunch and use items. (Pro tip train with the bears before the Burnflower quest)
Talk to redwood right after Mesaheart flamepatch and burnflower become warriors then talk to her again right after you get exiled. Make sure to talk to her multiple times so you get all she has to say. Then once you’re done doing everything for the wedding you need to go back to the rogues hideout and redwood will be there. Talk to her to fight her