What is ironic about mrs .mallard's true her husband's death

The author is saying don't get married because it is a form of slavery for woman, the women's vow for marriage is to love, to honor, and to OBEY
She's being joyful because she won't be a slave anymore, and has her own life to live she's being held back by being a housewife 
After she says she is free, she dies
Spring time new life, new birth 
She's being honest with her feelings
She lived for her husband, but now she'll live for herself 
Free body and soul
Brently had been far from the railroad accident, and did not even know there was one
The doctors said that her death is caused by her overwhelming joy when she sees her husband alive, but she was actually disappointed because her brief moment of freedom was taken away from her (stereotype of male doctors)SettingLouise Mallard's house
Beautiful spring day
1980s