Taken from a new show, with this episode airing only last week.
Alas, I'm not fluent in Turkish,and haven't watched the full show, but I've done some research, so here's a basic summary of the events that contextualise this scene.
There is a love triangle between the three characters: Deniz, Sila, and Teoman.
That morning, Sila is furious when she sees a message on Teoman's phone arranging a date with Deniz.
Deniz is unable to shower at home that morning due to her water being cut off, so she decides to have a shower at school instead.
This gives Silas the perfect opportunity to prank her: stealing her clothes while she's in the shower, locking her in the locker room and throwing all of Deniz's belongings into the trash.
Trapped in the locker room with absolutely nothing to wear, Deniz quickly becomes claustrophobic and has a panic attack.
However, Silas' plan to humiliate her rival backfires. Teoman hears Deniz shouting and comes to her rescue, offering her clothes from his locker. Oversized, of course, but with no other alternative.
Silas is furious when she sees her rival wearing Teoman's clothes, as her plan inadvertently pushes the two of them closer together.
Teoman had witnessed Silas throwing something away, puts two and two together, and rescues Deniz's belongings. He later washes and returns them to her that evening, but only after she mistakenly thinks that he was the one behind it.
Unfortunately for us, Deniz does not try to reciprocate as a means of gaining revenge, instead acting as the more mature person.
If only there was a version where Teoman doesn't rescue her. Silas rushes back to the locker room, expecting Deniz to still be there, so it would have been fun to see how that would have played out.
Here's a condensed version, with the prank occurring around the 8 minute mark:
https://youtu.be/4UM6555Yes8?is=-VoxIPJUzgk_E_RY
Here's a link to the full episode, with the prank occurring around the 1 hour 15 minute mark:
https://www.dailymotion.com/video/xausb7u