My duck has a swollen eye and its watery and foamy? She's a healthy 4 year old duck. But these past few days her eye has gotten swollen and looks infected. PLS HELP SHES VERY IMPORTANT TO ME I HAVE 9 DUCKS AND 14 CHICKENS AND 2 GUIENEAS AND SHE'S MY FAVORITE OUT OF ALL OF THEM. I'M WORRIED SHE MIGHT GO BLIND? PLS ANY HELP?