It is very possible taht the wasp stung Callie. These viscious insects will go right for the eyes as they must know it disables the victim.
Put a cool compress on Callies eye,however if the swelling does not quickly abate or you suspect that Callie it damage to her eye or an allergic reaction it is highly advisable to see your vet.In addition, DO NOT give Callie ANY human OTC's including benedryl as most are toxic to cats.
Dedicated to Cats and the people who love them!
Please press ACCEPT if my answer was helpful and leave feedback Thank you! Terri