"Intervention"

The "enabler" that Jill Mccorkle refers to in "Intervention" is someone who ignores one's behavior, allowing them to continue to act in a destructive way. So it is used negatively in the story toward the character of Marilyn, who Rusty calls an enabler to her alcoholic husband. It is not what we think of out of a "social science" context (in general, we associate the word "enabler" with someone who provides help to one). In "Intervention," Marilyn turns her head whenever Sid is driving drunk, or passed out drunk. She is ashamed to have voiced her concern to her children that Sid may have a problem. In fact, at the end of the story when all of the children gather at their parents' house with the intent of having an intervention with Sid, Marilyn refuses to acknowledge her role in providing them with a reason to intervene. 

Sid was also an enabler for Marilyn when she was an alcoholic after she cheated on him. He turned his head the other way as well, cleaning up her mess, and avoiding questions. It was Marilyn who ultimately chose to get help for herself one evening after she had vomited all over the bathroom floor. This is another reason why she feels guilty for intervening with Sid. She feels that she should allow him to recognize his problem on his own time. However, it is ironic that Rusty call her an "enabler"  after she had played the opposite role in concerning Sally with Sid's problem.