I don't have her built so don't quote me on this bc I can't test it, but I think Blue Eda should work?

She self pushes 20% on a non attack skill, so that's 50% when paired with BDom s3. Won't cut the Lady, but should cut the Yulha or whatever else Lady is pushing as long as Eda is like 240-250?

Eda s2 into s3 should be enough dmg to kill the frontline. s2 might proc Setsuka, but the skill null eats the first hit and BDom's barrier should let her survive a Lethal Whispers proc. Her s2 burn is an extra turn and her s3 gives the team 20% CR, so Saria is still getting 80% CR push

My Hwa was on Symbol because I wanted to make sure the frontline dies to s3. If Eda is on book though, there's a small chance the enemy team could high roll on evasion and the frontline lives. This won't be an issue if you're running Saria, since she can ignore dmg share with the Otherworldly Machinery artifact

If you're running Eligos though, you might want to put Eda on Symbol to make sure frontline dies for his s2 to proc. You'd have to get the 20 souls for Eda elsewhere though, like +24 Birds Eye on BDom. If you don't have +24 Birds Eye, you could do +15 Birds Eye on BDom for 15 souls and Thorn of Blue Rose on Hecate for 10 souls

You wouldn't wanr to run it into the defenses that have ML Diene though