Y'know, I thought Tango was hyper.........until I got Jazz!
Comparatively, Tango's a slug lol! Like you, I've had similar troubles with Jazz, she's SO different than Tango when it comes to her attention, AND her attention span.
I know both will increase with age, but it's been a challenge up to this point.
Jazz pretty much runs herself~~finally~~into exhaustion, at which point she'll collapse on my lap or her bed and rest. When they play, Tango will get to the point where he wants to quit whereas Jazz just wants to keep on going, and she'll bug Tango after he goes and lies down. He's dominant, so he'll sometimes have to growl at her to let her know he's done. She's 7 1/2 months now, and I've noticed a very slight change in her behavior, in that she'll tend to slow down a bit before finally resting, and I can hold her and calm her down that way.
Training's been a real challenge, she just won't stay still and focus long enough to learn anything. I finally had the bright idea to teach her "Wait!", which essentially means that she has to be still before she gets a treat. I clicker train mine, which has been helpful with Jazz in shaping that behavior. Basically all I did was show her that I had a treat, and then correct her every time she jumped up or nuzzled my hand or did anything other than stand still at which point I gave the command, and she had to be still till I released her. I figured that would be harder to teach than sit, but after failing with sit and down and a couple others, I tried it, really in pure desperation, and no one was more surprised than me when it worked lol!
Currently, I'm not trying to train much else, just reinforcing that command. Now when she sees I have a treat, or I bring out the training treats for a training session, she's SO much better about calming down. She'll go crazy, and I tell her "Wait!" and usually after the first command, she'll just stop dead still. I don't make her wait long, she's too young yet, before I give the treat with, of course, LOTS of praise.
Just as a comparison, when Tango sees that I have treats, he'll get excited for a minute, but as soon as I start to talk, he'll stop dead in his tracks, his attention COMPLETELY focused on me, and won't move a muscle. He, just naturally, will wait, I didn't train him to do that. Jazz on the other hand is jumping up and running in circles and scratching my legs and practically doing back flips!
They are SO different.