Since the actress is from Washington, she is of white ethnicity. In the Netflix series Everything Sucks!, which was about two sets of high school kids in Oregon in 1996, she played the character Emaline Addario.
After that, she starred as Alice, a roommate Amy Adam’s character meets in a mental hospital, in the HBO drama Sharp Objects.
The director was initially planning for Sweeney to have a lesser part, but after seeing how well she performed, he decided to give her character a larger role in the series.
She studied the experiences of young women who self-harmed and dealt with mental illness in order to prepare for the part. She even went to hospitals to meet others who had self-harmed.
Sydney balanced filming Everything Sucks! during the week and Sharp Objects on the weekends while doing both at the same time.
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