We won't really know for sure whether or not Lisa was going to bring up "the lie." If you recall, Lisa was about to start talking to Brandi about what she was hurt about, and Brandi conveniently interrupted Lisa and stated that it wasn't about Lisa, but about Brandi and her hurt feelings.
On the subject of the lie, I don't know if anyone noticed, but when Brandi was talking to Carlton, she turned extra red in the face when she brought up the fact of Lisa attempting to bring the tabloids. IMO, that is really telling that Brandi was full of it.