As a rule, would never cross a show cocker with a working cocker it is creating a mongrel cocker of two separate breeds (ongoing debate I know lol ) ... so it is about making money. It is a fun and pretty easy way to make a few hundred unless you do it right then you normally run at a loss
I would ask her for the vet she uses, as any good breeder would have no problem giving you this info along with the name and contact details of atleast 2 owners from previous litters. Then you need to contact all these and get their feedback and if possible go and visit the previous litter dogs.
A good breeder will meet with you and then quiz you left, right and centre and a really great breeder will want to visit your home and meet your family to ensure you and your home is correct for this breed and their dogs, or will have someone do this for them..... I do this for 3 of my local breeders (Great Dane, Collie, Staffie) as a free service to ensure the homes are fully vetted.
They will also NOT let you have the puppy until it is 8 weeks old minimum!
Animal Rescues will always vet you and your home before rehoming and a good breeder will also do the same although I know 98% do not sadly and this is an active thing some of us are trying to change, one litter at a time.
BUT many breeders do not really care as much and will just ask you about your home and family and what your life is like, have you come to meet the pups and them a couple of times BUT at the end of the day you must remember breeding is a BUSINESS and do not ever let any breeder tell you otherwise or else they would not do it and the animals would be free to 100% vetted homes and owners if it was all about increasing the gene pool and doing it for enjoyment/hobby only.
Health checks with a vet are just like you going to your gp for a once over, so not really a good indication... but a good start ... That's why you need the breeders vet details so you can check that the breed your purchasing has had the breed specific health checks and only the vet can tell you if the breeder your buying from has requested these. Also the vet can also tell you if the mum and dad dogs have both been checked PRIOR to being mated to ensure their health to infact mate in the first place.
Buying a new family member is one of the most important decisions you will ever make in your entire lives.... so has to be right :-)
It is better to be 100% happy if there is even an inkling of doubt walk away and a high price is not always a good indication of a good buy.
All the above said and done you will do what you want to do and will probably have a puppy from the litter and be very happy and if problems arise then there is normally a drug or operation that can sort it out, so no real worries, just in an ideal world that will never sadly exist and I just rant more than most