It takes baby steps. If she is not afraid of your had when you change her food and water you have quite a good start. The next step is the one that takes the patience. Put you hand in the cage and just sit there with your hand near her. If she backs off then stop. Gradually she will get to the point that she will trust your hand quite close to her. You can also get some millet and put it on your hand, offer it and just wait, remember patience. She will come around but if you get impatient you will undo more than you have done.
Perch training can come anytime after she trust your hand. Right now she is not afraid of your hand but she does not trust it.