If this puppy is ignoring “fetch” items and chewing/shredding things up, keep shred-able objects away from her. I know you said you dislike crating her, but crating is a tool and is only abusive if you use it too often and as a way to keep her “out of your hair”.
If she’s mouthy with objects, this is good for a hopeful retriever!!
If she gets something she shouldn’t have, tell her she’s very clever, clap at her, do NOT be angry….ask her to bring it to you. If she does, make a huge fuss and tell her she’s amazing and give her the object to play with, or give her a treat (not something crappy like a milk bone, but a several pieces of meat, cut small, one at a time to show her that bringing you things is GOOD. This IS retrieving.)
A very smart breeder I worked with stressed to puppy buyers that puppies that get things in their mouths are GOOD puppies, smart puppies. Despite puppy proofing, this WILL happen. Best to teach the pup that bringing you treasures is a pleasurable thing, and are easily taught to trade and deliver to hand, vs. an owner that flips out and creates guarding because the pup is worried that you’re angry/trying to take the awesome thing away.
If the pup has something in her mouth you wish she did not, encourage her to bring it to you (“What have you got!!! Aren’t you a clever puppy!!!!!!!”) vs. (“Give me that, that’s not yours”) etc.
Have fun with your pup. If you’re really wishing for a good retriever, seek out a nice class that offers retrieving lessons and you won’t be disappointed.
