Read each sentence to find out whether there is any

Solution

The sentence lists three actions in a parallel structure:completing her assignments quickly
working well in a team
she showed great initiativeThe third item "she showed great initiative" breaks the parallelism because it uses a different grammatical structure (a full independent clause).
To maintain parallel structure, it should be: "showing great initiative", matching the gerund forms "completing" and "working".

Corrected sentence: The new intern was praised for completing her assignments quickly, working well in a team, and showing great initiative.