|Spoiler Warning: Plot and/or ending details are in the text which follows.|
After unveiling her identity, she confiscates Elizabeta's cocaine, and can no longer be dated. She is a smoker and may have a criminal past, as hinted by the boss at U.L. Paper. She claims to work with Mallorie.
It is unknown when Michelle got assigned Niko's case. There is evidence that it is from the start of the game, as she is already lying to Niko.
During a mission for U.L. Paper, Niko asked about Michelle, to which he is replied with "Michelle,Karen."