The 25-year-old actress split up with her boyfriend in December following a year together and she fled to Canada's Rocky Mountains shortly before it fell apart to stay at a facility which enforces a week-long vow of silence, reported Vogue magazine.
"I felt really uncomfortable, even before my relationship ended, I went on a silent retreat, because I really wanted to figure out how to be at home with myself," she said.
The star, who shot to fame as a child by playing Hermione Granger in the films, said she does not think her celebrity status has had a negative impact on her relationships.