Society holds young people who are free to attend parties and entertainments under stern obligation to pay their social calls. Young mothers, professional women, students, invalids, and semi-invalids are not expected to conform rigidly to the same rules. If a young woman can go to a party to amuse herself, she must call afterwards to acknowledge the courtesy of the invitation.

As a side note, it is interesting how much leeway Ms. Edith gives to professional women throughout this etiquette book. There are quite a few cases where they are given similar advice as men.