Edna was brought into direct conflict with her society in many ways: From the beginning, she demonstrated that she had not the slightest interest in exercising her motherly instincts. Slowly she began to discover that she was not born to be a mother. Second, she slowly discovered as well that she was not a moral, nor immoral person. She simply wanted to live life as it came regardless of what social norm was. Therefore, she took on a lover, allowed herself to fall in love, and lived for the moment, leaving behind her social expectations as wife and mother.
Third, she got so tired of such social expectations that she simply left the household, kids, husband, and everything, and moved into the "pigeon hole" where she held parties, and felt free to be herself.
Finally, as she entered the ocean once she realized that life was nothing like she hoped it would be, and that the love she was seeking for was probably non existent, she simply ended her life. Nothing moral, religious, nor socially responsible was crossing her mind. Not her kids, nor her husband. Just the fact that she was a human being in need of much more than she was offered and that she had the right to live, and die, in whichever way she saw fit.