What is the purpose of Miss Baedeker's character in chapter 6 of The Great Gatsby?

Here is Miss Baedeker's quote:

"Anything I hate is to get my head stuck in a pool," mumbled Miss Baedeker. "They almost drowned me once over in New Jersey."
"Then you ought to leave it alone," countered Doctor Civet.
"Speak for yourself!" cried Miss Baedeker violently. "Your hand shakes. I wouldn't let you operate on me!"

Miss Baedeker defends alcohol and, by extension, the false happiness that comes with the glittering lifestyle of the rich in New York. She serves to indicate that the rich of New York would rather have false happiness than true emotions.