Well, it depends on your army really. Using an elf army with her, really adds alot of +damage, defense and crit. Shouldn't underestimate her, the morale boost is nice. Regalia slots is definately the "worst" item slot, so if you're not using elves, she is probably the worst.
I used the dwarven wife with a dwarf army also, together with the dwarven ale gave me +2 morale to the entire army. Powerful stuff.
I like Xeona the most though. 2 weapon slots are just so pimp
