Analyze the image of the woman in "White-headed Song" and tell me what the theme of this poem is.

This poem portrays a divorced woman with distinct personality, which not only reflects the marriage tragedy of women in feudal society, but also focuses on praising the heroine's noble love attitude and beautiful sentiment. She values friendship and despises money; Require oneness and oppose "ambiguity". When she learned that her husband's feelings were not experts, she did not make any compromise, nor did she swear crazily and whine feebly, which showed the dignity of women's own personality. She buried her pain in her heart and bid farewell to her ungrateful husband calmly and gently by buying wine. How quiet and enlightened she is.