Clean with alcohol, sand every point that touches, clean with alcohol again, but also dry wipe it before the rubbing alcohol evaporates. Then use "Gel" super glue. It takes longer to set up, but it's thicker to fills in the gaps. Make sure you have it propped up so there is no weight on the wing as it sits for 24 hours drying. (Use books stacked or anything you can find to take the weight off.)
Those kind of breaks are nearly impossible to fix because those parts are designed to have some flexibility. The problem is any glue you use will not have the same physical characteristics of the plastic piece and it will not flex in the same way it did.
Definitely try He-Bro's suggestion of the gel glue, but it may be a lost cause. The good news is that you have a base body for making Spirit or Teela's gold unicorn.
"I reject your Prince Adam and replace him with the original barbarian from the jungle."
My first Swift Wind did that, I used Gorilla Glue. It held, but as snake said it lost it's flex. But it did hold....I even glued a step on my deck with Gorilla glue and it held until I sold the house. Ha!