Apostrophe

"'My God,' Georgette said. 'What a box to sweat in!'
'It's hot.'
'Hot, my God!'" (p. 27)

"My God!" is the apostrophe in this passage. More often than not, this is the apostrophe that appears throughout  this novel. Since Georgette is calling upon God, it is technically an invocation, as well. I believe that if one were to look at every day conversation, "my God," or "Oh my God" would be more common than any other type of existent apostrophe. I feel that this phrase is not necessarily important, it has just become extremely common over time as it has nearly developed into a cliché. Overall, I wish this phrase wasn't used as often, because to me it seems a little bland. I wonder if it wasn't slightly less common then, or if it has always existed in such frequent use.