These are excellent insights into the deeper significance and symbolism in the story.
1) "Heart trouble" likely refers metaphorically to Mrs. Mallard's emotional distress and anguish in her marriage. Her heart has been troubled by her husband's controlling and oppressive nature. So when she thinks he has died, her heart is finally "free" of that trouble.
2) The underlined words showing her as a "goddess of Victory" reflect her sense of liberation, empowerment and triumph in that moment. After years of oppression, she feels she has conquered her fate and won her freedom and independence. She sees it as a supreme victory.
3) That Victory and empowerment are short-lived, however, highlighting the poignancy of her position. She is thrilled at the thought of escaping her marriage, only to have her husband abruptly return and dash those hopes. So the language suggests her inner strength and defiance, even though her external circumstances remain unchanged.
4) There are also hints of bitterness in her reaction to seeing her husband again, suggesting the depth of resentment she has harbored all these years. The story subtly conveys how she has been compromise and crushed, rather than liberated, in her marriage.
Overall, the details are rich with metaphorical and symbolic meaning highlighting Mrs. Mallard's complex inner life and the tragedy of her situation. Please let me know if you have any other questions!