When Does A Puppy Grow Out Of That “puppy Phase”?!?

I got a puppy and she is 8 1/2 weeks old. Please answer this question: If she is constantly and properly trained, when will she grow out the phase that I can only explain as “the puppy phase”. I love her and am being nice but adamant about rules. Don’t worry, Im being nice I’m 14 and we’ve had 2 other dogs but this is MY first dog so I have to care for it. I would love for her to stay a puppy forever but I can’t put up with this craziness for too long! lol
So again: She is a 8 1/2 week old Cockapoo, (half poodle, half cocker spaniel) puppy. (named Ginger – the movie star!) If you’ve seen Gilligan’s Island you’ll know that reference
When will she grow out of that “puppy phase”?