Samantha leaves Katie behind naked

'...I decided to just leave you here.' Said Samantha.

'What! No!' Yelled Katie shocked.

Samantha just walked away, with a grin on her face. Katie tried to get after her, but she already left. Katie started to panic! The next class would start in ten minutes. She had to be there, because she had a lengthy speech to give in Ms. Templeton's class. And if Katie fails it, she will also fail the class. Katie started to look for anything to wear, but to no avail.

What should happen next?