I like her, and I used her in my last playthrough as soon as I got her. She was doing quite well.

One thing that's often overlooked is the fact that Divine Knights can equip spears and crossbows. Crossbows suck, but spears are great, second only to knight swords. My setup was pretty much

Divine Knight (Mighty Sword)
Jump
Abandon (my favorite reaction ability, but you can switch it out for Speed Save if you think it's too cheap)
Equip Change
Move +2

Have her switch between swords and spears depending on whether you're fighting humans or monsters.