My advice would be to use a more positive approach. I doubt she actually "knows better" as to her they are just interesting new toys sitting out for her to grab . If she has retriever in her, she's especially going to be driven to pick up anything new. Even Tommy brought me an ornament from the tree the other night. He used to pick up everything and go running off with it. I made the mistake of scolding and saying "Tommy no!" so he'd take off and go hide it and be sneaky about it . Then I started using a positive approach. It took some time and practice to undo my original approach but now he's wonderful. I look up and see him with an ornament and I calmly say "Oh, what have you found? Wow can I have that?" I hold out my hand and he walks up wagging and gives to to me, and then I praise him lavishly and thank him and sometimes give him a treat or a favorite toy (I always keep some toys he doesn't have access to full time to use as rewards). Life is much easier now with this new approach. He doesn't hide things he finds anymore, he brings them proudly to me . It is his instinct to retrieve, so I never bothered to try to change that about him. As long as he brings things to me without destroying them, I'm satisfied. (And no he's not bringing me things constantly, just here and there )

edit to add: You may need to crate her when everyone is away from home for now. She's young yet and those new fascinating "toys" will be hard for her to resist. With no one to monitor her she could really get into some trouble and even get hurt. Could you perhaps block her in a "puppy-safe" room while you are gone? That could be another alternative. That is what we used to do with Tommy when he was younger, he was gated into the hallway with access to a couple rooms where he couldn't get into anything.