She sure is cute! I think she looks chi.

Especially once those ears pop up! I love her coloring, is that a little white on the top of her head, too?!
All chi's are different with their exercise level, but just pay attention to how she is reacting. If she's panting excessively or kinda skip-running, she may need a break. Exercise at this point in her life though is super important because not only does it keep her healthy and form good habits, but it wears her out so much that she'll (hopefully) sleep right through the night!
Have fun with your little Tilly!