Simplify the following text for a Grade 9 native English-speaking person.
Original: Realizing that Monroe remained in her dressing room due to stage fright , and that Hawks was growing impatient with her tardiness , Russell started escorting her to the set .
Simplified: Realizing that Monroe remained in her dressing room because of stage fright , and that Hawks was upset with her being late , Russell started walking her to the set .