"Let's walk together where we once lived" is a symbol of the future. Walking with you means watching you walk on the road of your own choice of future!
Your mother's walking on the highway symbolizes that she has been walking smoothly, while your walking in the sewer symbolizes that you are not on the right track. You have to explore and take many risks to embark on a road that your mother thinks is feasible. The well here is a trap. The "bottomless clear water" means seemingly good, but I don't know how deep the water is, which also reflects that your mother can't infer what kind of difficulties you will face. Your playing with water reflects that your mother thinks you are still immature. This state will make you have problems. "Menstruation is still complaining about how my mother looks at me and makes me fall into the well", which is my rational torture. In other words, your mother has the idea of not interfering with you, but you have problems and she has a conscience. This dream reflects the inner entanglement of a great mother! How lucky you are to have such a mother!
So you should choose carefully, mature well, take good care of yourself, listen to other people's experiences, and think twice before you act. In case mom is worried!