According to Eunice Kennedy Shriver, when Rosemary returned to the United States from the United Kingdom in 1940, she regressed; Shriver later stated that Rosemary became "'increasingly irritable and difficult'" at age 22. Rosemary would often experience convulsions and fly into violent rages in which she would hit and injure others during this period. After being expelled from a summer camp in western Massachusetts and staying only a few months at a Philadelphia boarding school, Rosemary was sent to a convent school in Washington, D.C. Rosemary began sneaking out of the convent school at night. The nuns at the convent thought that Rosemary might be involved with men, and that she could contract a sexually transmitted disease or become pregnant. Her occasionally erratic behavior frustrated her parents; her father was especially worried that Rosemary's behavior would shame and embarrass the family and damage his and his children's political careers.