Mistress of Hymns suggestion: Buff her by switching her A1 damage to HP base and/or allowing the Warmaster mastery damage to be included in her heal ratio. Either or both of these buffs would make her a staple in CB w/ a retaliation set. The current kit has a weakness in that she is a support character who's healing effectiveness is partially based on the damage she does w/her A1 which is based on attack. So there is an inherent catch 22. You can optimize her A1 heal, but at the cost of sustainability (where she won't be around to resurrect), or you can maximize her sustainability at the expense of her A1 heal. Switching her A1 damage to HP base will give her kit more synergy and take advantage of her strong HP base stats.