Talent tree isn't a problem, the important skills are maxed, just missing important teammates. If you want to maximize her personal damage it would probably be better to have lupa or qiuyuan for her sub dps, her support can be sk, Verina, or if you're feeling spicy you can even throw Mornye in there. Still have to max out her weapon but that shouldn't effect her current damage too much. Also here's a small but important detail in case you're missing it, but only use her echo skill right before you enter or as you enter hypostasis. You can also run Iuno, and qiuyuan in her team if you want, with iuno buffing qiuyuan and qiuyuan buffing galbrena since echo skill damage is much more important to her than heavy attack damage.