Something wrong with Conellia AI.
At least on my account; she does the following ONLY:
If in leader spot, she will cast her A3 on herself only, even if shes full health, and an ally isnt.
If not in leader spot, she will cast her A3 only on the leader position, regardless of health.
I also find that if shes not injured, somebody else is, A3 is off cooldown, she will use her A1 and not heal at all.
With her as lead, doomtower some level of 3 waves, she was the only one who could heal by skill, she did 93k healing on herself only, she died twice, got resurrected by Altan, I took it off auto before her turn to check if her heal was off cd, it was, put it back on auto and she used A1, then died the next turn again. Altan did 82k healing from Bloodthirst only.
Very sad for a fusion.