[Tippiechick]

Dolphin-
Go to Wal-mart or anywhere else and buy just a basic brush in the pet section. The brush I use at work is a $3.00 Wal-mart brush. It should have metal bristles. It should not look like a rake. That would be a slicker. You just need a brush.
Cockers just need a lot of brushing, especially is your baby gets a "Correct Cocker Clip". If you can brush every day, you can prolong the amount of time in between grooming by reducing matting. Also, if your groomer is afraid of Cockers biting her, ask her if she would groom him/her on ACE. ACE is a sedative-type medication that is given to some dogs to calm them down before grooming. (Think doggie Valium.) Your vet can prescribe it. We have a shih-tzu that can only be groomed on ACE. It is not actually sedating them. It just calms them.
Cockers can be funny babies. I was attacked by a cocker a couple of months ago. It got a hold of my face. I now have a small scar on my upper lip. Even though I love many of my regular Cockers, I am still very nervous around them because of the biting. I would consider asking her to try grooming with the ACE. It will allay her fears without casuing any undue stress on your baby.
You might also want to consider changing groomers. It may just be too hard for her to stress over being bitten again.