English coursework fail?

Oki so at school we have all done 5 eays and they've been sent off to the moderators to get marked. We've been told that if you've copied anything from the Internet or anyone eles and they find it then you've pretty muched failed... Anyway one of my friends have copied like one sentence off the net and into her essay and it's been sent off, she's worried. Will she get done for one sentence?