Hi and welcome to you and your pup, glad you found us!
Nothing much to add to previous comments, puppies need a LOT of sleep at that age and can get wound up and over excited pretty quickly. Keep play sessions short and stay consistent, decide when its „game over“ and calmly give her time out. The so called „Zoomies“ are well known amongst us cocker lot,
, (although all over tired pups of any breed can react similarly) but they can get a bit out of hand if you allow yourself to get wound up as well. Stay quiet, calm and firm and stick with us here on COL - you won‘t find any better moral support than here!
Best of luck!