cast guidance on her and don't recast it on yourself for the persuasion check.
This fight is so unbalanced though, they say they're level 4, but they have at least level 6 hit dice and level 5 abilities.
another option is to remove the check from her.
One thing I've noticed with these passive checks, unless you do something to modify dice (like do a check yourself) reloading saves for some reason seems to be locked in to the exact same result, For example, perception checks for the goblin cache you have marked on your map. 10 reloads results in 4x failures. Cast guidance on self, self fails but 2 other party members ( the last 2) now have different results.
It seems passive checks are loaded into memory rolls that are called as needed and you need to push those numbers along to get another result
edit - Weighted dice could also just automatically make passive checks succeed.... it doesn't appear to have any effect on passive checks at all.
Last edited by Montiness; 25/10/21 11:41 PM. Reason: additional