My shelter dog doesn't seem to know how to play with toys, what do you think I should do?

Hi! We adopted a shelter dog around a year ago estimated to be around 4 years old, a female Shepherd mix. She doesn't seem to know how to play with toys, even though she will show some interest in small stuffed toys I toss, she quickly loses any motivation she has. If try to trade or toss her another toy to get her to play with me, she would drop the toy very easily and refuse to get it again. She likes and chooses to play With me, punching and running, play bowing. I just can't get her to hold anything or play with toys With me. The vet said her teeth looked OK, she eats fine, and chews on things like bully sticks. I would like to teach her to hold objects eventually but have never had a dog that didn't easily pick things up during play to start teaching it. Not sure what step I'm missing or what I can do to get her drive up, other than maybe trying a flirt pole or furry tug toy which I haven't tried yet. What do you think I should do? Thank you very much for your time and feedback.

Thank you! We have tried your suggestions and seen improvement! It's a work in progress but at least she's actually making some now.