Uny's Eyebright tincture is made using Dr. Christopher's exact original formula which has 1/8 part of Cayenne it. So the tincture you got from Uny does have 1/8 part Cayenne. If you look on the label on the bottle you'll see 1/8 part Cayenne. Its the same Cayenne that she sent you extra of in the bottle.
She sent the extra Cayenne in case you want to make the Eyebright to Dr. Schulze's formula. Dr. Schulze used one full part of Cayenne in his formula. So if you want Dr. Schulze's formula you'd take the extra Cayenne she sent you and add ALL of it into the bottle of Eyebright.