Tatiana Maria
Majesty
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Probably because of the British tradition of married women taking on their husbands' first and last names (though I didn't realize that isn't necessarily the case when a titled woman marries an untitled man).
Here is a more detailed guide from peerage bible Debrett’s on addressing an Honourable married to a Mr.:
Daughters of a Baron, Baron and Baroness, Titles, Forms Of Address | Debrett's
A daughter of a baron bears the courtesy style of 'The Hon' . When she is unmarried this style is followed by her forename (eg The Hon Rose Hays). After marriage she drops the use of her forename and uses her surname only (eg The Hon Mrs Smythe). The style of 'The Hon' is not used before...
Daughters of a Baron
A daughter of a baron bears the courtesy style of 'The Hon' .
When she is unmarried this style is followed by her forename (eg The Hon Rose Hays). After marriage she drops the use of her forename and uses her surname only (eg The Hon Mrs Smythe). The style of 'The Hon' is not used before 'Miss'.
The style of 'The Hon' is only used on the envelope in correspondence, in written descriptions (usually only on the first mention) and in formal documents. It is never used in conversation or on invitations or on visiting cards, when the correct style is 'Mrs', 'Miss' or 'Ms'.
How to Address the Daughters of a Baron
The recommended (social) style of address is as follows:
Beginning of letter
Dear Miss Hays
End of letter
Yours sincerely
Envelope
The Hon Miss Hays/Hon Mrs Smythe
Joint form of address
Mr Damian and the Hon Mrs Smythe
Verbal communication
Miss Hays/Mrs Smythe
Invitation
Miss Rose Hays/Mrs Damian Smythe
Description in conversation
Miss Hays/Mrs Smythe
List of Directors or Patrons
Rose Hays (or Mrs Damian Smythe)
Place card
Miss Rose Hays/Mrs Damian Smythe
Legal document
Rose Jane Hays commonly called the Honourable Rose Hays
A daughter of a baron bears the courtesy style of 'The Hon' .
When she is unmarried this style is followed by her forename (eg The Hon Rose Hays). After marriage she drops the use of her forename and uses her surname only (eg The Hon Mrs Smythe). The style of 'The Hon' is not used before 'Miss'.
The style of 'The Hon' is only used on the envelope in correspondence, in written descriptions (usually only on the first mention) and in formal documents. It is never used in conversation or on invitations or on visiting cards, when the correct style is 'Mrs', 'Miss' or 'Ms'.
How to Address the Daughters of a Baron
The recommended (social) style of address is as follows:
Beginning of letter
Dear Miss Hays
End of letter
Yours sincerely
Envelope
The Hon Miss Hays/Hon Mrs Smythe
Joint form of address
Mr Damian and the Hon Mrs Smythe
Verbal communication
Miss Hays/Mrs Smythe
Invitation
Miss Rose Hays/Mrs Damian Smythe
Description in conversation
Miss Hays/Mrs Smythe
List of Directors or Patrons
Rose Hays (or Mrs Damian Smythe)
Place card
Miss Rose Hays/Mrs Damian Smythe
Legal document
Rose Jane Hays commonly called the Honourable Rose Hays
Regarding the "Mrs. Surname" convention for untitled women (the quote refers to peers' children who are not using a title, but the same would apply to untitled commoners), here is a page which cites "Titles and Forms of Address: A Guide to Their Correct Use. London: A. & C. Black Ltd., Third Edition, 1932." as its source:
When "Mr." is used alone with a surname, it refers to the eldest son (of a Viscount, baron, or commoner). His younger brothers are distinguished from him in speech by using their Christian names, similarly to the use of "Miss." Their wives adopt precisely the same usage, only with "Mrs." instead of "Mr." Mr. Plowden is the eldest son, and Mrs. Plowden is his wife; Mr. Thomas Plowden is a younger son, and Mrs. Thomas Plowden is his wife.