keep at it. stand in front of it and talk repeat the same thing over and over .healthy SMALL treats when it does even close to what you want. it will bond w/ you. could take mos/ yrs females tend to be more quiet -predator /nesting instincts the only way to tell is have a vet check or check the vent yourself.
All you need to do is to set up a devoting session of at least four 10-minute every day to teaching your pet cockatiel how to talk. You will be required to begin by repeating one easy word to your pet cockatiel. Check out http://www.ehow.com/how_2096140_teach-pet-cockatiel-talk.html for more particulars.