It sounds like perfectly normal boxer puppy behaviour to me

And normal behaviour from a well-mannered adult if Ekim lets her do it. He'll put his foot down and demand better standards of behaviour later. But for now, she's a baby and she gets what is known as "puppy licence".
Pretty much as you or I might tolerate a 9-12 month old human biting or hiting, but wouldn't entertain it for a moment from a 10 year old. Well, she's the equivalent of that 9-12 month old infant

and some degree of tolerance until she learns better behaviour (and is capable of learning it) is required.