Thanks for your question.
I suggest she should have a pregnancy
test. If she is really pregnant & does not want to carry this pregnancy she may choose to terminate it if it is legal in your area. Taking medicine without confirming pregnancy
is not a good practice & may cause her trouble. She should also opt for a reliable birth control in future, preferably a permanent one if her family is complete.
There are medicines available to terminate pregnancy, but these should not be used without medical supervision. So, she should contact a doctor for help.
Best of luck.