Make Decisions And Say Things She Agrees Withīe sure to try to talk to Leliana whenever you get the chance, be it while you're out and about with her or at the camp. There are a number of things that can be done to increase her approval rating.
A high approval rating must be maintained in order to not only ensure she is loyal but to romance her as well. Allow it to get low enough and there is a chance that the character may end up leaving the party for good. Companions in the game have an approval rating that affects how much they approve of what the player is doing.