What age is she ?,stop giving her retrieves,get her back to basics,sit her up throw dummies around her pick them yourself,concentrate on her heel work,make sure she doesnt break from heel,when you start to become happy with her steadiness to thrown dummies and heel work,get her out with some friends walk her at heel and get your friends to throw dummies tennis balls etc from either side of you with them crossing over in front,if all goes well get her back out on a shoot and leave your gun at home and concentrate on keeping her steady.
When you are happy enough with her give her one or two ret