I didn't read all these comments.
I remember there being lots of rumors in January after she premiered Mona Lisa that Jive was pissed at her for doing it so they shelved the project indefinitely, but I don't think that was ever confirmed. However, she found out she was pregnant in late January/early February. So my guess is, her pregnancy caused her to put the project on hold. Then she was planning to release an album in 2006, but got pregnant again. By that point, the songs intended for Original Doll were probably not the direction she wanted to go in anymore, thus we got Blackout in 2007.
She recorded Gimme More in August 2006, so I'm 99% sure that song was not intended for Original Doll.