2) The Intermediate NEXT (About 4-7 on the NEXTing scale)
Obviously, this is a mixed hybrid of the Beginning and Advanced. Here, you still have short contacts with her, but you remain as pleasant as possible. You might avoid her and hangouts where you might meet so you can avoid further emotional scarring. In the Intermediate NEXTing, she WILL most likely be keenly aware of the changing status between the two of you--but she may or may not confront you about it. In the Intermediate NEXTing, you deny any bad feelings towards her. You do not act jealous or angry or spiteful. You are simply, "very busy lately," and that's it. Ironically, this actually twists her up even more b/c she detects the difference, but cannot put her finger on WHY or what she did. In the Beginner's NEXT she knows EXACTLY why you're shutting her down. In the Advanced NEXT, your goal is to never even trigger her awareness of the process.
3) The Advanced NEXT (About 8-10 on the NEXTing scale)
This is actually the ideal form of NEXTing. Here, you gradually downsize your involvement with the female. No sudden/radical changes in how the relationship is going--just gradual change. You don't avoid people, places of things you would usually do. Even if she is in the same room and same circle of friends. You actually might hang out w/ her one on one occasionally to give her the illusion that nothing's changed--but in reality you are gradually pyasing her out of your life. You simply stop caring about her or her life--but you don't alter your OWN life in the slightest (other than spending more free time with other people). This doesn't mean that you are an ******* or anything like that to her--it's just that when she starts to tell stories and/or insert drama into the enviornment, you psychologically, "drift off"/"go away." You may or may not leave the room or enviornment--the advanced person might simply switch attention to somebody else in the room for a short while. When she tries to rope you into being an IW again, politely find a reason why you can't do it/need to go right now, etc. In the ideal Advanced NEXTing she will NEVER EVEN NOTICE THE DIFFERENCE. Maybe she'll wonder in retrospect several years from now how/why the two of you drifted apart. But it will never enter her mind while you are in the midst of gradually phasing her out of your life.