I am in the process of training my second retriever pup, so i am fairly new to this and was hoping to get some advice. I have a 4 month old female british lab, who I am training using Evan's Smartwork system. She has been progressing very well until earlier this week when she broke early and got hit by a bumper in the mouth while i was throwing a mark. She bit down when the bumper hit her, and made a small gash in the side of her tongue. If that's not bad enough it also happened to be during the same session that i introduced her to real birds. She has dealt with wings a lot before this but no whole birds. Now she is acting scared, and shying away from bumpers, and birds. Not sure how to correct this problem without making it worse. Any advise would be greatly appreciated.