shooting over dogs

As far as the ruining them. I ask because I have a dog that was a great strike dog. Great hunter, just an all around great dog. Pretty much 'finished'. But I sold her to a buddy and he shot over the bay. He soon got tired of hunting and sold her back to me. Now since she has been back, she will strike a pig, but as soon as the other dogs get there or she sees us coming she leaves. Does not stick around. (We do not shoot over them, we don't even carry a gun)
The only thing I can think is that she got scared of the gun??..
That is why I asked if anyone has ever seen that ruin a dog.
Do you think she will come out of??

Alan - Come on...we have been hunting quite a bit lately. We just do it at night or first thing in the morning.
We would be glad to have ya!