Oh i actually tried her again in a less chaotic map after posting the comment, and i figured out that she had that ability, i think it should be in the help screen. After trying her i thought she was kind of op actually lol.
I don't think an extra shield is that necessary (maybe if it granted just a couple frames of invulnerability after a hit?), but i think my skills in doom might be above average so maybe other people would find that item helpful.
Anyway, i really liked this mod, the fast paced action and resource management you have to do with the weapons is really fun, so either way i'd love to see more content for this mod! Definetely one of my favorites.