I don't think it's really anything to worry about. Didn't she just have her check-up? If she always has this, then the Vet would have seen it and said something if it was something to worry about. Depending on her breed, it might be "normal". Smoosh faced cats have this and their eyes need to be wiped pretty much constantly. But it's possible she has Feline Herpes (very common) and weepy eye(s) are sometimes an issue with it. As long as that's the only thing that's happening, I'd worry about something else
Hi. I agree with mrsgreenjeens
. Just make sure you wipe the goop off at least a couple of times a day. Keeping the area clean reduces chances of bacteria building up and causing an infection.