I don't think there's much more you can do. Talk to her all the time, repeat key phrases, such as every day you come in the house say 'hello' or 'step up' or 'wanna come out?' when you see she wants out. I haven't tried the CD's myself so I'm not sure how they work. Saying things when your bird is excited will help too. That's one of the reasons birds pick up on 'hello' so quickly usually, they're excited that you're home or excited you're coming in the room and then you say hello to them.
You may want to look at her surroundings too. Birds won't talk if they feel vulnerable or insecure. Maybe her cage is near a window where she can see wild birds and she doesn't feel safe or there's another animal or piece of furniture or something in her immediate environment that makes her feel uneasy.
You may want to try putting the words she does know on cue, you can take a look at Michael's article
here on him teaching Kili to overcome her shyness and to say hello on cue. Also check out the other posts under
Training Parrot Vocalizations. They might be able to give you a few more ideas.
Or maybe she's just one of those birds that will never talk. Not all grey's will talk, that's why it's so important to never buy a parrot solely because you want a talking bird.