Is she afraid of the bang when the gun goes off or just the gun in general?
Does she show avoidance to the gun without a shot?
Does it happen every time or is it a new development?
Is she due in season and just being a bit emotional if it’s a new development?
Does she have an ear infection and the bang causes her more discomfort?
(There may be things going on that your probably not aware of.)
Don’t take to a clay ground as your not in control of the environment or exposure and cannot stop the shooting if she decides to get out of dodge ! Many dogs have been ruined like this.
Throw a ball and clap your hands and do this regularly when out.
Then do the same with the gun but leave the cartridges at home.... repeat repeat repeat.
Once the bitch is comfortable with this use a starter pistol or dummy launcher as described above (at distance and work in) shoot behind your back but make sure there’s nothing behind you first especially the dog or into a game bag.
You must first understand what her fear/discomfort/avoidance is.
Good luck.