Fractals help for my fiancee.
Knight’s armor works great for a AH (Altruistic Healing) build. There are several variations but I use a 0/5/30/30/5 build. There is a sticky at the top of the guardian forums that describes it in detail but as she’d likely have to do is re-trait. I use greatsword and scepter/focus/shield for all fractals, only swapping out my utility skills for certain encounters. It’s an extremely viable build bringing group buffs and great healing for her. If she uses a hammer, the symbol provides protection (-33% dmg) for those inside the symbol and it’s considered more of a group based weapon with an AH build. Even if there were two such guardians in the fractal, it would work and they would each have fantastic up-time while still providing many party wide buffs. Pretty hard to die from mobs honestly.
I’m sure others can offer other viable builds but some version of an AH build is probably one of the most common builds.
Edit: She might even like to try the “Healway build” located on this page as well but I think that would require a change to Cleric’s gear.