She is the textbook dedicated support than can free your other 2-3 units to build as much damage and self buffing load outs to maximize their DPS. She can give strong heals, defensive buffs, purge stop, buffs, raise with full life, give AP, haste and chain light with holy, and not elemental damage with meteor if needed. They balanced her by not giving her Quicken which would have immortalized her at S tier.