> I was of the understanding that Clerics couldn't do any substantial damage with their abilities. So while she could have have debuffs like Defense and Resistance Down with Acid or Speed, Evasion, and Attack debuffs for a Numbing Poison, none would actually deal any HP damage. 

That's pretty much correct, although I would be willing to make a few allowances here and there. Like, inflicting Poison on an enemy would deal damage to them over time, but especially at low levels it'd be like, a handful of points every few rounds. Not really something that could be considered a major offensive skill.