Alma 22:21

Now when the queen saw the fear of the servants, she also began to fear exceedingly, lest there should some evil come upon her. And she commanded her servants that they should go and call the people, that they might slay Aaron and his brethren.

When the queen saw the servants were scared, she also began to be very scared. She was afraid that something bad would come upon her. She told her servants to go and call the people so they could kill Aaron and his brothers.

When the queen saw how terrified her servants were, she became afraid herself—afraid that something terrible might happen to her. So she ordered them to go call the people to come and kill Aaron and his brothers.