Based on the details in the passage, you can most reasonably conclude that Antigone's tragic flaw is Stubbornness.
A tragic flaw is exemplified as the error or flaw in a character's attribute that drives him/her towards destruction. These attributes may include lack of knowledge, pride, etc. which brings a transition in these characters that helps them to evolve as a better person and encourage the audience for such evolution in their character traits.
Thus, Stubbornness is the answer.
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