The behavior shouldn't be confusing. While I understand that you only have one snake, and don't intend to breed, you must remember that snakes are fairly simplistic creatures. They really only have 2 goals in life: eat and procreate. It sounds to me like she has a strong urge to do the latter. I would expect that she will stay off of food for +/- 6 months. All you can really do is wait it out. I would however, continue to offer a prey item every 2 weeks, until she decides it is time to start feeding again.
Hope that helps,