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.