
Unfortunately the chances are high that she will pass this onto at least some of her puppies. You could risk using a dog with a strong temperament, and from a line of similar but personally frustrating as it is, it would be a lottery, and depending on the strength of the gene pool here, perhaps not work risking. Your decision of course, but especially in breeds that should not be shy (?) I wouldn't. If you go ahead, you may be looking at running on the puppies for some weeks, to be able to properly assess those who have picked up this fault, and it is a fault after all, and those you might risk keeping, breeding again to a male with a good temperament.
Just to add that some dogs hate the show-ring, but may not necessarily have a 'bad temperament'. Don't throw the baby out with the bathwater.
Have you been back to the breeder of your bitch to discuss this issue with her? It helps to know what previous generations were like - problems can skip a generation after all. Just thinking outside the box - did anything happen that might have caused her problem now - being imported, shipped too young, might just have affected her?? Or even run on, and not socialised as others going to a pet home might have been?