My horse has yellow stuff running out of her eye ?

Call your vet, yellow means there's an infection. In the meantime, boil water, let it cool down and use a clean cloth to gently wipe the stuff from the eye.
contact a vet
I’d consult your trainer or check with the vet. You can also try to look online, but you never know for u
Join the fun and sign up to connect with our 200,000 members!