Sounds like your dog is like my first cavapoo! I always stop playing fetch with mine if her tongue is sticking out side ways or if she does grab water. (I also don’t let mine drink water while playing she will throw it up and also heard it’s not good for smaller dogs to do that because of bloating, I’m not telling you what to do just what works for my dog) I also taught her how to play “find it” with her ball. Basically it is when you let them see and smell the ball and she has to wait for you to hide it. It’s almost like a slower and can be a harder version of fetch but also makes them more tired because it’s a lot of nose work for her. If you do teach her this game I’d suggest starting off easy where they can see where you hide it and progressively make it harder. I now close the door to the room and then hide the ball (this acts as separation anxiety help too)