She ran back for her purse

"Give me a sec!" she says, already running back to the changing room as quickly as she could in her dress. As she came back to the changing rooms, she immediately heard the slapping sounds of a stranger's hips slamming into her friend's over and over, accompanied by loud moans. She thought about stopping to wait for Jess and changing back into her own clothes, but figured she didn't have time, so she simply grabbed her purse and ran back out.

As she was exiting the changing area, she spotted the man who was walking towards her earlier. He was talking to the woman behind the register.