Oh Ok now what you said about going to a +2 makes perfect sense to me know that I think about it as she was getting a -1 and I thought that sucked there. Thanks for clearing that up for me.
Glad I could help!
She is a tank now, plain and simple. 19 AC + Mirror Image + Armor of Faith + Heals. She just needs a taunt and then she can just stay there while the rest of the party does the DPSing.
Just wait till they add Spiritual Weapon(Lv2 Spell that will be available at level 3 when they add it,) and Spirit Guardians(Lvl 3 Spell we probably won't see in EA.) You won't have to worry about not dealing enough damage.
Trickster clerics can use mirror image and Spirit Guardians for a pretty nasty combo, letting them sit in melee while spirit guardian does aoe around them, and make bonus action attacks with spiritual weapon.