This is most likely an error, though she might've taken it off.
If the player wants to fend her off, they must close the left door, and keep it shut until she leaves. Eventually, she will appear at the left door. She will then move to the Main Hall, sexually sitting on a table, occasionally teleporting to non-adjacent rooms.
She is often the first to leave, though FNIA Chica might leave before her. She starts on the Show stage with Fredericka and FNIA Chica.