The Life of the Party - S5-E22
Corrected entry: When Roz is in labor at the hospital, Daphne arrives and tells the others that she came as soon as she heard. But she is saying this to Frasier, Niles, and Martin - the only three mutual friends that she shares with Roz. Nobody else could have told her to come.
Correction: First off, it is established that Daphne and Roz have a friendship of their own and, while the audience may never see it, there is nothing to say that they do not have mutual friends. But even if they don't have mutual friends, Daphne indicates that she received a message from her date (where he made up an excuse for standing her up). It is conceivable that Frasier, Niles or Martin left a message for Daphne (off screen) and she was letting them know that she got there as soon as she received the message (since she was on a date). At worse, it was a poor choice of words but it is not a mistake.