My pup (1 year) has that habit too. He would drop his heavy kong ball on to my lap repeatedly when I'm watching tv etc. Or if I was not interested, he'd bring me another toy. But he gets that I don't wanna play, and he will gladly play with his toys by himself. That's because I've taught him that if I don't engage after a couple of tries from him, then leave me alone. I've set boundaries for him and he understands that. If you're not comfortable with your dog doing the same thing, take the ball away. Ignore, ignore, ignore. You're not doing anything bad, you're just setting rules: When I don't wanna play, you don't play with me. The toys are yours and you have your space, they'd have to learn that everything is under your control. For your case, my suggestion would be arranging some 'play time,' at least twice a day 10-20 mins minimum each, where you engage with her in a game of fetch, tug o' war, etc. After the session is over, put the toys away. It'll become a routine and your dog will learn that there are certain times of day where he gets to play, and others where he has to respect your time and space. Very important to set out rules, boundaries and guidelines with GSDs or any other dog earlier, esp with a baby on the way.