What lie did blanche tell Stanley in scene ten?

In Scene Ten of "A Streetcar Named Desire," Blanche tells Stanley that she is going on a trip to visit a wealthy suitor, claiming that she has received an invitation to stay at a luxurious hotel. This lie is meant to create a facade of her continued allure and desirability, masking her deteriorating mental state and the reality of her situation. However, Stanley sees through her deception, highlighting the tension and power struggle between them.