About the wild parakeet!! getting into my bird cage!!!?

Ok you know how I told you guys that a liberated parakeet got into the cage yesterday.(I guess I shouldn't use wild parakeet since the US is not a keet's natural habitiat Australia is). I took the keets that I had before out of the cage and put them on their playstand. I took the cage with the newcomer outside and left the cage open. I came back a fewhours later to find that the stubborn keet was still sitting in the cage. She just doesn't want to leave does she!!! I guess she loves the idea of a a free meal every day. Should I try again to urg the keet to go back outside...should I ask one of my friends if they want a parakeet??? Or should I keep the keet and go buy a larger cage for the three??