Aunt Dahlia and Cannes

Aunt Dahlia stays at Cannes chapters 1, 9
Aunt Dahlia loses money at Cannes chapters 1, 4

They deal with each other in Right Ho, Jeeves 1, 4, 9.

Every dealing, in order

Chapter 1Aunt Dahlia holidays at Cannes (earlier)
Chapter 1Aunt Dahlia loses heavily at baccarat at Cannes (earlier)
Chapter 4Aunt Dahlia lost money at baccarat at Cannes (earlier)
Chapter 9Aunt Dahlia stayed at Cannes (earlier)