Yeah I agree on the 3 Healers point. I usually Run Chydis with AW-Iris and if I need a third healer I usually drop Echidna who at max lv + affection out heals Silver or Gold Healers for a cost of 20 range but with an option to burst out as a platinum lv mage.

To me Fedora is at the back of a long queue of units to level and given she would need to be 50cc40 to come close to replacing my almost permanently benched Alissa.
[I was actually considering CC her at 30 to feed to other characters with Range Increase 2 skill which I actually use. But I've resisted that temptation so far.]