You need to exercise her before you try to get her attention. Those dogs have absolutely insane amounts of energy. Think about trying to get the attention of someone who just did 5 lines of pure Columbian cocaine, that's what life is like for your puppy. Get a little backpack for her and put a couple of water bottles in it. Then go play catch at the park for 30-40 minutes. Or go for a run. Or put some roller blades on and let her pull you around (with a proper harness, not a collar). After one or more of those activities is the proper time to train her.

Have you considered separating the beagle and her while she gets to chew on a flavorful bone? Also, discipline the beagle. He needs to understand that he can't just steal things from her. This isn't anthropomorphism, dogs can learn not to steal from each other. Regardless, she should get some time to chew without worrying about defending herself. Chewing is a natural instinct for dogs, and it's important they can satisfy that urge.

Have you tried the crinkle toys? One of our dogs loved the crinkle toys, and the other loved the squeaker toys.

Golden retrievers, and Golden Doodles are pretty insane when they're young. It takes a lot of work to exercise and train them. The good news is that they settle down a lot in a year or two, and then they're a lot easier to deal with. Despite the saying, you can reach an old dog new tricks, so there's still time for training after she grows up a little.