Her eyes bug a bit because she actually resolved that issue! She probably would spend more time as a coyote if people weren't weird about it.

"No! I'd love to go for a real run."

She can run as a human, but it doesn't feel the same as when she's a coyote. It's so much more relaxing. Especially if she had someone to chase. It doesn't occur to her that he doesn't know that she can do that yet, she's just excited to have a real running buddy.