Take another look at the sentence:

In the restroom, Tishena was brushing her hair, freshened her lip-gloss, and took deep breaths, trying to work up the courage to walk to her first speech class.

When you list actions, you must use parallel structure. Here, freshened and took are both simple past tense verbs, but was brushing is past progressive, wrecking the parallelism.

To fix the sentence, change was brushing to brushed.

Go to the next sentence.

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