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That is a normal lab trait. Start close to the shore and get the dog to give you the bumper at the shore line. Lots of praise. Repeat 100 time and take one step back repeat 100 time take another step back..................Labs also want to shake as soon as they leave the water...complicates the problem a little more. Forced fetch will also help a lot.
Sounds like your dog has been through enough in her short life, I’d spare her the force fetch training.