Babushka says not one step backward. Every seventh shot, she gives a damage bonus! Also, the thing starts active, making her one of very few buffers with a start-of-battle skill activation. Her first skill is still defensive in nature, and the percentages got bigger. She's actually useful in a number of situations, either for reducing enemy firepower in specific fights (usually Gundam or tank related) or just the straight DPS boost from the get-go. You only really need her up to Mod 2, but the Mod 3 art is cute.

Her pre mod form is here

Generally decent buffs esp. at night, and she can be an evasion glass tank (100 evade!) in a pinch. Not bad if you actually kite your pistols but be wary of her limited HP. Honestly, you want a real tank in front still. With her mod, her usefulness continues due to the fairly good buffs she provides.

Her unique expedition equip is decent (even more evasion), but the real draw for it is when you can use it with her other unique equips for the set bonus.