So this morning Artoo accepted and ate some millet that I held out to her after I cleaned out her cage. This was a first!
Then, when I was putting her food cup with breakfast in her cage, she stayed on the perch and just turned around to watch me do it - even though I was super close to her. After that I offered her millet again from my hand as a reward for being so brave and she accepted and ate some. She got lots of praise both times.
Before today's breakthrough, I tried offering her millet now and then and she'd back away. But I'd tell her that it was okay and we'd try again another time and that she was a very good bird.