These repeated unwanted sexual advances are textbook sexual harassment, specifically creating a hostile work environment. If she had gotten them to text those things to her, she would have grounds for a lawsuit.
Here's the definition of sexual harassment:
Harassment can include “sexual harassment” or unwelcome sexual advances, requests for sexual favors, and other verbal or physical harassment of a sexual nature... harassment is illegal when it is so frequent or severe that it creates a hostile or offensive work environment.