Is she in the same tank? And the tank isn't divided, they're just in there together? Then possibly yes, if they get to scrapping and one of them injures the other's eye.
Of course, there's always a possibility this was caused by something else - impossible to know without doing complicated medical tests - but I think if the popeye WAS due to parasites or something like that, both eyes would be affected. But since I suspect this is injury related, your other girl should most likely be okay.