Entropian is a problem for many breeds. I have seen it in Labs, Hounds, Boston Terriers, and Cocker Spaniels.
Doesn't necessarily mean they were bred wrong or whatever. But, Cocker Spaniels have bad eyes usually as they are pretty droopy. I wouldn't breed her. There are so many homeless Cocker Spaniels in shelters and rescues. I would get her spayed. It doesn't mean she will get a bad coat or gain weight. You still will exercise her the same and feed her the same. Pyometra is a huge problem in young intact females, so you have that to worry about too and it's fatal. If she packs on the pounds, well up the exercise and cut back the food. Just because she has a good pedigree also isn't a reason to breed her.