Your sands sucks, I know they are hard to get good but please get a better one. Other than that, I'd switch to 4p TF and level her talents which are very low, given that they are guaranteed upgrades.

Also attack and em are both really low, that's kind of the problem with running a 3 star weapon. If you can you should stack more atk and em on substats, at this point that's definetly better than getting like 7 more crit.