I agree with everything that has been said, what's done is done - Don't look back, just look forward
Billy came from there too, we made the same mistake
We didn't do too bad, Billy was kc and was only at that place for 5 days before he came to us, before that we do know that he came from a nice house rather than a puppy farm. Still not a reputable breeder by any means but not as bad as it could have been.
My advice to you at this moment in time would be to socialise your pup as much as possible
. Get her used to as many things as you possibly can. Get her to meet lots of different people & experience lots of things & definately defintely enrol on a good training class.
You don't know how much exposure she's had to life, it could be lots, but its likely to be little
,now is a critical time for her to get her out into the big wide world , this will reduce the chance of her having any behavioural problems in later life that may be as a result of lack of socialisation as a pup.
Most importantly don't dwell on it, there is every chance she will be fine, just focus on the things that you can do to help increase her chances of turning out as good as a well bred properly reared (pre 8 weeks) cocker
pm me if you want to ask anything about Billy