Kathy -- Yes, another bird would make her act worse and you would lose any training that you've accomplished so far. A second keet would just distract her and make her not want to bond with you. You're doing the right thing by putting the perch through the cage bars ... for now. Eventually you want to put your hand in the cage with the perch to get her used to having your hand in the cage. It may take time, but she will eventually step up on the perch even if she sees that your hand is holding the perch. You say that you had your hand in the cage and she pecked at your hand but it didn't hurt -- that's great because that means that she is tasting you. It means that she is interested in getting to know you. She may still be frightened and try to bite, but because of that she efinitely seems interested in you.
It may not take you a year to trin KiKi. Sometimes keets will all of a sudden willingly step up and will soon want to be with you. Continue putting your hand in her cage for 10 minutes a day (Helwa recomended that to me and it's working so far) and feed her a few bites of millet. This will help you gain her trust. Also, as you know, she is molting and she's moody because of that. She should be done with her molt any time now and may be more willing to learn. Just keep up the work and be consistent!

Good luck and keep us updated on KiKi.