Morning after pill?
Answers: The morning after pill is supposed to be influential up to I believe 72 hours of the initial "mishap." She could just be stressing out and thats cause the delay.
It's not 100%, but may do periods to be irregular, I would speak if no sign within two weeks of expecting too capture a preg test. it should work without delay unless you bought some cheap bullshit ones.
It could take up to 2 weeks until she get her period, most individuals get it between the 7th and 9th year. Tell her don't worry, it will come. It's merely about 90% forceful in preventing pregnancy. If she is more than a week postponed, she should take a pregnancy exam.