I've seen that quote around the net as well, but never found a source for it. Nor has wikipedia.
As far as I know Cordelia's powers have never been stated on the page. Possibly in some comic she did not actually appear in, but she's such an obscure character that I can't see why any writer would bother.
For more on-topic stuff:
https://www.marvel.com/articles/comi...es-a-red-queen