Is she the one that sold for $200?! Oh no, my heart literally just broke hunny. I know how much you wanted one, this is just so terrible.
As far as a price goes, she has both wings which believe it or not, is a good thing as we can try to fix her! I've paid anywhere from $35 to $65 for my Alitas, including a damaged MOC one. Actually it was me who bought the eBay Alitas, but they were all in HORRIBLE condition. However in your case, where she was so expensive, I would assess everything about her; hair, body cutie marks for any other damage. Alitas Sunglider, to me, seems really prone to hair frizziness; more so than the other 3 Argies. If her hair is silky, then she is worth more. I'd say a realistic price that would be fair to both parties would be between $65 and $80 for her IF she really is near mint.
Message me sweetie, we can talk about how to fix the wings, I had one snap off my Alitas Sunglider too...but I was able to fix it. I'm so incredibly sorry to hear this happened to you. Seeing her with her wings off makes me so insanely sad for you. The seller is fantastic too, and I'm really shocked that this happened. But don't despair hunny, we can at least try to fix her if you plan on keeping her!! Pony hugs to you my dear, I can't imagine how hard it must of been for you to see her like that:(.