contestada

What is the best way to correct this sentence containing an ambiguous pronoun?
Tania and Ariel went to the mall after she wrote her exam.
They went to the mall after she wrote her exam.
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Tania and Ariel went to the mall after Ariel wrote her exam.
They went to the mall after writing the exams.
She wrote her exam after Tania and Ariel went to the mail.