I’ve never understood why people pop on with a comment like that, L M. Do I agree on puppy age? Yes. But she has the puppy, so your comment is moot.
Pitlove gave you a ton of great information. Keep the pup on the purina for a week or two to make sure she adjusts well, then start transitioning. Definitely pick 2-3 4-5 star foods, and start her on a rotation diet early. I am a big Fromm guy and almost always use Fromm Puppy Gold as my go to first transition food, it’s easily tolerated, not usually a huge jump from what the breeder had them on protein wise, and is a great company to boot.
Good luck
