PYRA AND THE TEKTITES 5: LOST ON EARTH by Tyree Campbell

Pyra is abducted from Europa by How-To, a minion of Mark the Shark. Shark claims Pyra owes him money, and insists that she make a smuggling run to Earth to pay him back. After Pyra arrives on Earth, she finds that she does not know where she is, or where she needs to go. A girl named Kathi, who works in a fast-food restaurant, tries to help her. When two boys accost them, Pyra is able to defend herself and Kathi.

But matters are not always simply for Pyra. She finds that she gets more on this trip than she bargained for. But she also makes a new friend. Now all she has to do is complete her smuggling assignment.