Cordelia Bride +attack -speed

You could probably just go all in with attack and run something like Brave Bow+ Death Blow, and maybe just run a breaker skill to deal with bulkier units or cancel affinity to deal with tri adept ravens. Basically, take advantage of Bridelia's super high attack and just try to maximize your two hit damage potential. If you really want to, you could still attempt to run the quad build, but you're gonna need a lot more team support in regards to speed buffs in comparison if you want reliable quads along with the speed+3 seal just to reach neutral speed again, probably best to just focus on two hits if you ask me personally.

You have two options; the Firesweep Bow or Brave Bow. You'll want Death Blow regardless of weapon choice, unless you can get Life and Death 3.

With Firesweep Bow, you'll want Swordbreaker for really fast sword units. Threaten Defense is the best C-slot, unless you want Threaten Speed, because 32 Speed is not unsalvageable. You will need a Faye, however, to pass on the weapon.

With Brave Bow, you need Death Blow, Desperation, and Threaten Defense. Make sure to have a lot Reposition units and Hone Attack and maybe Drive Attack if possible. If you can pull a Klein, you can get Death Blow 3. Or get Death Blow 2 from Hawkeye and Brave Bow+ and Death Blow 3 from a 5* Klein(Don't worry, it works.)

She won't be the best, but she is completely usable.