When Marge reaches the breaking point, she leaves for a much needed vacation, leaving the rest of the family to realize how much she does for them.
Marge is pushed to the edge when she has to get the kids ready for school, clean the house, feed Maggie, get Homer’s bowling ball fixed, hem Homer’s pants, return the videos, do the shopping, flea dip the cat, pick up the dry cleaning and take the kids to school. And those are just her morning chores. On her way home, Marge goes over the edge. She stops her car on the Springfield bridge and blocks traffic in both directions. After a long stand off, Homer is brought in to talk to Marge. When Marge gets out of the car, she is immediately arrested. Marge is seen as a feminist hero for bringing attention to the plight of the over-worked housewife. Careful to not upset any voters, Mayor Quimby arranges for her release.
After seeing a commercial for “Rancho Relaxo” Marge decides she needs a vacation by herself. Leaving Bart and Lisa with Selma and Patty, and leaving Maggie with Homer, Marge boards a train for a little rest and relaxation. While Marge is living it up, Lisa and Bart are trying to survive with Patty and Selma, and Homer hands his hands full just trying to take care of Maggie.
In the middle of the night, Maggie crawls out of bed, down the stairs and out the front door, looking for her mommy. Homer searches the house in vain, looking for Maggie. Still with no sign of Maggie, Marge calls to let Homer know she is coming home. As Homer prepares a speech to tell Marge he lost Maggie, Chief Wiggum shows up holding Maggie. When Marge arrives at the station, Bart, Lisa, and Homer greet her with open arms. They vow to help her more and be respectful of her needs, just so she promises to never, ever, ever leave them again.
Source: 20th Century Fox