Apparently the court ruled that Abercrombie was supposed to read her mind.
Quote: The Supreme Court had to decide whether Elauf was required to ask for a religious accommodation to allow her to wear the scarf in order for the company to be sued under the 1964 Civil Rights Act, which among other things bans employment discrimination based on religious beliefs and practices.
Despite wearing the head scarf, she did not specifically say that, as a Muslim, she wanted the company to give her a religious accommodation.