Reset NPC health points

[Ormoulu]

I'd like to make a mod that increases an NPC's (say, Trashcan Carla's) health, level and combal skills. It seems to work fine if I meet the NPC for the first time. But when I load a save made before the mod was installed and if the NPC already appeared in the game, it seems to stay as weak as it was. So I wonder if there is a way to reset it's HP and any other characteristics saved.

 

PS: thanks for your understanding, I'm not a native speaker )