Once A Fool
I don’t think Wanda has retired to heal at the end of WandaVision. I’m pretty sure she’s searching for a way to undo the undoing of her hex.It's a hero broken/hero redeemed arc, and basically returns her to neutral. Hero goes bad for <reasons>; hero does <bad things>; hero realizes what they have done; deeper hidden villain is revealed to have orchestrated or taken advantage of <bad things>; hero undoes <bad things> at a personal cost to themselves that evokes or repeats <reasons>; hero retires from public eye to grieve and heal in a healthier manner.
The direct follow-up is: hero learns to deal with expanded <awareness &/or abilities>; hero may or may not take mentor; hero is called to battle once again, possibly to replace or repair mentor's actions; hero becomes peer of mentor or acknowledged "sage" or "experienced/older & wiser" character. At this point we've finished and returned to a stable status quo.
Fortunately, the remote location removes the morally problematic element from her first hex.
Unfortunately, there are plenty of other things that can go catastrophically wrong.