Jealous Violetta : Season 1 Episode 16

The entrance tests are almost reaching their end. After passing the singing test, Violetta still needs to pass the dancing test if she wants to join the Studio. But Ludmila is there to make sure that Violetta will miss the test and be unable to join the Studio. So she and Naty made a plan, they locked Violetta in the janitor's room and stole her phone and diary, so she won't make it to the test.