Can I encourage my puppy to stay acting like one as she gets older?

We got our new baby yesterday-a gorgeous 2 pound 4 ounce, 9 week old Pomchi (yes, yes, I know it's a mix, which was why we wanted one). She is lovely and sweet and cuddly and rambunctious and crazy and hilarious, even highly intelligent, all wrapped up into one, and I can't get over how perfect she is. I was thinking what a shame it was that the puppy phase is so brief, and was wondering if I could encourage her to keep her puppy attitude by continuing to try to get her to play in the same ways, stuff like that. Her pom mother and chi father are both very lovey and playful.