Demented, Rflong does not put CC in her world, so you need to remove any CC if you want her to be able to use your house in her world. If you want to keep the CC in, then just save your house until the world is finished and just use it for yourself. Most CAW builders do not allow CC because any new ep, sp, or update can break the CC and make the world not function. It is nothing against CC, it is just the way CC works in Sims 3.
Rflong, the new update that came out this morning, will assure you will not have any problem with your Ambitions lots. The new update fixes the crash caused by using user and EA created Ambitions lots. So for simmers who update their game, they shouldn't have any more problems with that issue. I know you were concerned about it.