That Terramycin is what you want. The scabs under the eye look a little like fowl pox scabs. Bubbles or foam in the eye that later forms crusty drainage sealing the eye shut, can be from MG, a chronic respiratory disease. MG sometimes can be a complication of fowl pox. Fowl pox usually would have more scabs on comb and wattles from mosquitoes spreading the virus, so I don’t know if this is what is happening or not. The eye may have been pecked or scratched causing the scabs. I would be tempted to get Tylan 50 from a feed store and give her 1.25 ml orally 3 times a day for 5 days, just in case of MG. Be sure to clean the eye and get any gunk out before applying the Terramycin 2-3 times a day.