I would suggest offering her some mental stimulation rather than just physical exercise and games, its sounds to me as if she‘s frustrated. Cockers just love to use their noses so you could introduce her to sniff and search activities. Hide treats, toys etc and send her off to look for them, you can start by hiding things behind cushions etc and then increase the difficulty and distance. Make her sit and stay (good exercise), while you go and hide things in another room and then release with a „Find“. We do the same outdoors on walks, I just discreetly drop a toy or a dummy and then after a few yards send him back to look for it. A cardboard box full of rolled up balls of newspaper with a few treats thrown in will create a bit of a mess but will let her use her nose. There are lots of ideas online and you don‘t need to spend a fortune on commercial dog games, just a bit of imagination.
Dogs minds don‘t work like ours unfortunately, so trying to reason with her is unlikely to get you very far, praise her good behaviour and teach an alternative behaviour to the bad, - a sit, a down, or even a give paw with praise when she‘s done properly, are ways you can distract her.
10 months is „a difficult age“
but is also a great time for nurturing the bond that will stand you in good stead for the future, so try and stay patient but be prepared to invest a bit of time teaching her things rather than just offering her amusement.
You‘ll get there! Best of luck!!