Why is Daisy Miller shunned in Daisy Miller?

The key element that causes Daisy Miller to be shunned by
respectable society in this excellent novella is the low social class she occupies. Note how in
Chapter Two, Mrs. Costello points towards this by giving a number of reasons why Daisy Miller and
her family should be shunned and not accepted into polite
society:

"They are very
common," Mrs. Costello declared. "They are the sort of Americans that one does one's duty by
not--not accepting."

If this were not
censure enough, Mrs. Costello later backs this up by saying:

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"She is a young lady," said Mrs. Costello, "who has an
intimacy with her mamma's
courier."

So, in spite of the way that
Dasiy Miller dresses incredibly well and is very fashionable, her low social status and the way
that she and her family mingle with servants and people who normally have nothing to do with
their betters points towards why, in the eyes of Mrs. Costello and others, they must be
shunned.