The bravery buffs/debuffs can be transfered from battle to battle. You have to boost her bravery again. Try to get a friend with a samourai, or a samourai on you own, and use the meditate skill every battle !
This is a good way to boost the bravery of all of your characters.

put her in the guild barracks to increase her bravery

Yea slowly she regain bravery after i put her into barracks

Putting her into barrack is a short term solution if you dont have fina to boost faith.

🔥 more enemy , take the crystal will boost the bravery and bought forward 25% of bravery off battle. it is the only way if you do not have skill or barrack to boost bravery

btw , avoid knock down..... it will decrease bravery..... especially she is make of grass.....

I like mines as a Cucco.