FreeWilly....Wife became part of the Org. when she was 14 yrs of age. apparently dropped out about 5 or 6 years ago (before we met). We have been married for just over one year, and she returned to the Org about 3 months ago.
The assembly is an intensive programming session. She will come back a different person, when that happens, come back and tell us what is happening and we may be able to help you sort it out.
If she is going back it can be a combination of guilt and wanting the acceptance she had when she was younger. They won't really give it to her because she is married to you, an "unbeliever".
The best thing you can do is make sure you are a great place for her to be, and maybe keep any friends you have close so she feels like she isn't alone.
This is going to be hard on you, do a lot of reading and ask questions.
Good luck!
WLG