Don,
How was the dog force was broke? If you toe hitch or ear pinch the dog is refusing to retrieve? That seems odd for a lab, usually once they get it they are good to go unless someone stimulated them out of retrieving.
My guess is you are dealing with a refusal / incorrectly applied stimulation problem and the dog has been allowed or in advertently forced to get away with the refusal to retrieve.
Has the dog seen a lot of E collar? Even an ill timed bark collar can really turn a dog off???
If the owner is using the collar to enforce the “here” or call back command it can really turn into a bad deal.
Here’s something that may work…. try a little competition. Put out a few high energy dogs on a chain gang, work them thru a few good time drills, maybe even involve a few live bird retrieves. Make her sit on the chain and watch all the good times going on.
Put her away without any retrieve work or emotion on you’re part, pretty much ignore her. Repeat the same drill a few hours later, again putting her away again with no work. Just the chain gang to watch then back into the crate, the key here is in between each training session make sure you crate her, no running or playing, keep her crated up. Eventually when she is going bonkers try to take her thru a drill, but make her get you’re attention by executing the drill correctly.
This is similar to something I have seen work pretty well on a guy who was big into all age field trial dogs. He would work his dogs on a regular schedule, then 4 days before a big trial it was in the crate, onto a chain to eat, watch some other dogs work, then back into the crate. By the fifth day the dogs went from hard driving dogs to raving bird lunatics.
I kinda doubt that will really completely solve you’re problems though… I think you will have to go back to the force fetch. But once you go there she should fall back in place really quickly. Dogs usually will not forget that which they once learned.
Keep us posted, it’s always fun to read how other people get the wheels back on the wagon.