Each character has multiple fatalities that they can perform at the end of the match in Mortal Kombat 9 (2011 version) for the PS3 and Xbox 360.
This is the list of fatalities, and the babality and stage fatality for Mileena.
These can be unlocked and added to your moves list by performing them in either Arcade Mode or Versus Mode.
Looking for more finishing moves? Check out my complete fatality guides:
Fatalities and babalities for Mortal Kombat on PS3
Fatalities and babalities for Mortal Kombat on Xbox 360
Mileenas Fatalities & Finishing Moves
Xbox 360
Be Mine — Back, Forward, Back, Forward, Y in jumping distance
Rip Off — Back, Forward, Back, Down, A in jumping distance
Babality — Down, Down, Forward, Back, Y in jumping distance
Stage Fatality — Down, Down, Down, X at close range
PS3
Be Mine — Back, Forward, Back, Forward, Triangle in jumping distance
Rip Off — Back, Forward, Back, Down, X in jumping distance
Babality — Down, Down, Forward, Back, Triangle in jumping distance
Stage Fatality — Down, Down, Down, Square at close range
