LOL these yorkies really do LOVE their toys! Jake is the same way, he plays ALL the time. He plays really well on his own if I'm busy, but he prefers when I play with him. I'm home during the day since I work eves, and I spend the majority of my day playing with him. I do my housework early so I can spend time with him. When he gets tired, he'll jump up in my lap and start cuddling with me. Then after I leave to go to work, my son plays with him for awhile. My hubby comes home a little while later, and he spends alot of time in the eves playing with him. I've often called him the "energizer bunny" too lol. And, boy can they run! Jake sometimes looks like he's running in fast motion!
If you're looking for ways to tire your baby out, try taking her outside and letting her run around or take her for a walk. I've been walking Jake outside everyday to get him used to his leash. He LOVES to be outside, and that will usually tire him out a bit. He comes inside, drinks some water, and crashes lol.