We too were quickly reminded of the differences after the passing of our 11-year-old Golden, which we raised from a puppy to getting a new Golden pup that is nearing 7 months old. Whew! What an awaking this was for us. LOL, It was like having a new baby come home, which he was.
Bailey is adorable. I agree that the pic you posted of her didn't make me think she was a problem child. She's absolutely beautiful!
As for her energy level, well, the first thought that comes to mind is a reminder that not all puppies are going to be the same, even Golden puppies. I'm also reminded of past posts I've seen on this site that reminds me of the breed of dog we have. These are working dogs. They're sporting/hunting dogs who are full of robust energy that needs to put to use, or they can get into trouble out of cooped up energy, especially at such a young age.
If we go out for an evening and leave Brody in his crate for a few hours, well, we're going to encounter a dog wanting all kinds of attention and who wants to play when we get home. Forget going to bed until he spends at least a good bit of his energy. Therefore, we know that if we want an enjoyable evening and a good nights sleep, Brody has to get outdoors for a late afternoon or early evening hike to exhaust all his energy. I love the ole saying, "A tired dog is a good dog!" Fortunately, we live in a part of the country where we can go on a good hour hike with Brody off his lead. At times, especially when we first get going, Brody will run around like a wild animal. He goes and goes and goes!!! Then as he wears out a little, he will stay out in front of us, but never out of our sight until we begin our walk back towards home. We put him back on is lead as we begin walking back towards the house on the road.
With our past Golden, River, I used a thing called a Chunkit. Here is a link for the product. www.chewy.com/chuckit-classic-launcher-color/dp/38347?utm_source=google-product&utm_medium=cpc&utm_campaign=hg&utm_content =Chuckit%21&utm_term=&gclid=CjwKCAjw67XpBRBqEiwA5R CocRgMSf21W43XzJubr0ZvnnF2DJ1NhsycqUZ6k6cQ4AzoshK8 UUITMxoCQGcQAvD_BwE
River would run like a rocket as many times as I would throw the ball with the wand. It's a great way to get them tongue hanging tired. I agree with the other comments about not involving a puppy in overly aggressive exercise. Just toss the ball maybe 6-7 times so Bailey expells all that pent up energy. You'll love the toy and so will Bailey.
We too have a cat. Her name is Bella, and she's 3 months older than Brody. Brody chases her and her tail as often as Bella will let him. It's important to have an escape route/place for your cat. We have a small cat door that enables Bella to run to her safe place in the garage, but Brody can't get through the door.
This is getting long so I'll shut it down. Have fun with Bailey and do keep those photos coming.