"Morrigan told me to" Hahahaha thats a pretty good one

Actually, when it comes to redcliff.... redcliff is actually not that much of a challenge for me. So what I do, I make every effort possible to keep as many of the NPCs alive as possible. So what I do (using the no autolevel mod) is set Wynn up as a combo healer/AoE mage, and have her (manually controlling her character) healing on the ones that I can't control or set up tactics for.
In the first attack of redcliff I have her set up in an ambush point where she and Morrigan can use AOE spells on the choke point where the undead come in down thru that passage. The town defenders practically do no fighting as my team is intercepting them before they can even get there.
In the second wave down in the square it gets trickier, since the AoE isnt good to use around the defenders. So I'm manually using heals from her and Morrigan on the villagers along with throwing crowd control when possible. Or, noxing damange, if possible. Then me and usually either Sten (set up as dual wield) or Leliana (DW as well) try to keep as many of the invaders occupied as possible.
Second wave is challenging when you set out to keep as many of the defenders alive as possible. Makes it fun for me in what would otherwise be just a big fat melee.
But yeah... for myself MAYBE a potion or two here and there, but keeping the defenders alive does take some healing from the two mages on a fairly regular basis.
After that tho, I leave her in camp a lot, and avoid talking to her as much as possible. after my 3rd playthrough she just started getting on my nerves so bad that I try to stay away from her.