Usage patterns
〈人〉のお嬢さんsomeone's daughter
Mr. Tanaka's daughter is a university student.
お嬢さんと呼ぶto address someone as 'young lady'
The store clerk addressed her as 'young lady'.
お嬢さんはお元気ですかhow is your daughter doing? (polite inquiry)
How is your daughter doing?