+Def -Atk Machiah

Omg same problem.

I’m committed to building her because I like the character. I’m thinking maybe a triangle adept build could work - it could salvage her attack (along with the effective against bonus) and shore up her now iffy defense. So she would check all reds, plus blue calvary and armors. Perhaps add a bow or lance breaker.

Vantage. She tanks and destroys both Rein and Brave Lyn, one-shots them, and can vantage one-shot the other within the same enemy phase. If her attack isn't quite high enough for you to do this consistently, you can switch Distant Def out for Fury. Deflect Missile is a great Sacred Seal option to be able to tank Brave Bow Brave Lyns as well.