Jackson will get normal amounts of eye boogies every now and then, esp. when pollen is bad. And yes certain foods will give us more, but this is typically brown and easy to get out. But one day his eye began getting way more goop than normal (almost reminded me of pink eye). Very goopy, and began being yellow-greenish color. After 3 days of no improvement, I took him into vet, problem was solved with antibiotic eye drops.
It was some kind of infection. Eyes are nothing to mess with! So if you think it's out of ordinary, bring her in.