Thanks!! sorry for brainstorming in written form, this helped alot just won't quote it lol to scrolly.
If I want high AC, I throw a shield on and cast shield of faith and can get up to 20 ac. But, I also kept stats low without the ASI to take war caster so I could cast with a weapon in my hand and get advantage on con saaves. Without war caster, it does make a difference that at 4 she doesnt have that option yet.
That being said, he has been an absolute monster even without it. At level 3, 5 goblins and an ogre were tryin to kill him and it took them 3 rounds to do so (unconscious) all focusing on him 100%. They also didnt throw acid vials and light me on fire, though. That is why I kept shadowheart using cover, fog, doused in water, or in melee. Standing and spell slinging is a terrible idea with her, for sure.