Every now and then, the question of Wigfrid and her pasts has always been asked. "Is she actually a viking?" "Has she went insane with acting?" Well sir, I', here to give a short explanation as to why Wigfrid is the way she is. Let's look into modern-day theatre and acting - and we'll start with the concept of method acting.
Basically, method acting is a tactic that some actors use in order to do their best onstage, or onscreen, or wherever. What they do is, instead of just simply acting as the said character, they literally try their best to make themselves that character - going as far as going on strange diets, refusing to eat, almost never revealing their real self to public. One example is Heath Ledger, who used method acting to turn himself into the Joker (from Batman). However, said character also messed up his life itself, sometimes staying up for hours in a night being awoken by the Joker's insane thoughts.
Now, back to the Don't Starve universe. Wigfrid is probably also using method acting, as she seems to manipulate her own diets (only meat), her body structure (strength), and knows how to craft more realistic props for her character. Of course, there are times when she breaks out of character, and that is also perfectly logical. I'm not sure if it was Heath, but whoever was playing Two-Face in one of the Batman movies was using method acting. However, one of the crew members was carrying a light, which completely threw the actor off, getting him off-character. Fortunately, he was able to get back into character quickly. Wigfrid also experiences this at times, while inspecting certain items.
I hope you enjoyed my brief essay on Wigfrid and her relation to real-world acting. Thanks!