The reasons she die more is probably a combination of :
- people are using her as a tank because she has a shield
- hottest death area is the 3 intellect devourers fight where it's just her and the PC (or just the PC if they took a wrong turn).
Her stats distribution is just the generic half-elf cleric ones. If Larian wants her to keep the generic stats distribution and her "starter tank" role, they could always grant her the heavy armor proficiency for free at level 1. There is a precedent, as Wyll has the rapier proficiency.
I'd be completely in favor of giving her Heavy Armor proficiency and keeping her as is.
