She's a d/s.
Heals benefit from:
Mdmg, Heal Bonus, Wisdom
In that order. Notice how the more readily available aspect of healing (wisdom) is easily attainable (statting wisdom), whereas the more beneficial stat (Mdmg) is less available and harder to obtain (tierring, runes).
Ah. I was looking at her statement of "non HoTs healed for more or less the same" when extra MDam was applied. What confused me is that D/Wd's get the mdam buff but also the elite that increases heal strength which takes the mdam increase and amplifies it. It wasn't making sense to me that her heals would be more or less the same. With me, mdam food + my D/Wd's Mdam buff + healing elite makes my heals noticably stronger. I suppose this is different with D/S, and if so, why don't D/S get as much of a bonus effect?