What does she weigh? Is she eating well? If she is of normal weight and has a good appetite, plus is fed a species correct diet, she will likely fly once she is ready.
I had a grey for 3 years, from her 5th to 8th year when I lost her outdoors. I was foolish then and agreed to keep her clipped like the previous owner suggested. One time I took her out, assuming she couldn't fly, without checking her primaries. She flew high into a tree even though she had not flown at all in my house. I almost recovered her on the third day, then a strong wind took her and although I looked for 2 weeks, I never found her again.
Didn't mean to get off on that tangent, but it is worth talking about when we think a bird cannot fly. Don't take them out expecting they will be unable to fly off.
Now, with my Eclectus who came to me unflighted, I've had 2 start flying once they became comfortable here. They were older birds though who needed a good molt before their primaries were able to sustain flight.
If she becomes comfortable sitting on perches, you can eventually move her to the back of a straight backed chair. Place the chair close to a countertop or table. About 8 inches or a foot away. Then place a favorite treat on the countertop or table and urge her to hop to get the treat. Once she is willing to hop there, move the chair a tiny bit farther away. Over time she should be able to fly as she hops and eventually flap a few times to get to the treat. Verbally encourage her each time.
I am assuming the bird is used to you. I wouldn't try this with a bird who is afraid of me.
