The you are sadly sleeping in one of the best if not the best Archers in the game. She can hit high evasion teams. Alot of people in JP run her along with Rosa. I highly suggest getting her.
This is most likely a Truststone maximization thing and not the unit alone. I'd wager they use a Luck set and a Accuracy set with a both a Dex and Accuracy passive. The 'Nose for the Hunt' skill is the icing on the cake.
Raw stats are shown on the website she comes with high Dex and Luck by default meaning ACC is going to follow suit. You can deck her out with high ACC equipment like I did except with her bow because I know she's going to hit regardless. Also I want to add her sub job ranger comes with a guaranteed hit move which again isn't needed if you are building her for the role she plays.
I suggest using the set up I provided. DO NOT use the trick Lance Sub job because she won't use the job to it's full potential. Also with the right team comp she can get both Luck and Dex past 500(for Luck) and 550(for Dex) meaning someone is having a bad day.
You can get Eliza past 1,500 Atk with TS and C.0din on a main but I'm personally am against it for team composition purposes. Honestly if you need a ranged unit I'm going to suggest you use Eliza or Alaya (When she comes out). And if you're and ice main then 1 of the 2 need to be on your team at least
I forgot to add use the Odin Esper he has a ACC branch and high Dex and Luck or C.Odin plus they both have man eater. I don't care what anyone says use either or Espers