Echo is beautiful! A couple of things I'd like to mention. I, too, handraised Eclectus (among many other species) for years, and one thing that people may not be prepared for is the picky phase that they go through right about this age. Are you weighing Echo every day? I ask because when they start to wean themselves, they can be stinkers about not eating enough and can drop weight pretty quickly. Make sure that she's maintaining. As she starts to fledge, she will naturally lose a little "baby fat" due to the increased exercise, but you don't want her to lose too much too quickly. You have mentioned that she's losing interest in the formula quickly already, so I suspect she's going through that phase now. Make sure that she is getting plenty of thick, warming foods like oatmeal with ground nuts mixed in, birdie bread, and/or a mixed-grain-and-legume hot mash, and offer them multiple times throughout the day so that if she's feeling picky and not eating a lot at any given feeding, she will still have plenty of opportunities to eat and get some calories into her. Now is also the time to start introducing her to many other kinds of foods, like sprouted seeds and a variety of vegetables. Ekkies need a lot of dark-colored veggies in their diet, so I would start adding steamed leafy greens (e.g. spinach, kale, chard), green beans, sweet potatoes, carrots, etc. I say steam/cook them because babies tend to prefer warm/cooked foods, and you can add them to a hot mash for easier integration. You can also offer all these cooked foods by hand to increase the bonding experience. Then, as she gets older and used to eating a wide variety of foods, you can start offering her raw veggies.
Also, I completely agree with the person who said to ignore a bite rather than correct it or punish it. What's even better and more effective, though, is to avoid the bite to begin with. If you watch her body language and observe what she's telling you, you will be able to back off before the bite even happens. The best way to teach her not to bite is to not give her the opportunity to do so. Plus, if she learns that you understand and respond to her body language, she will be calmer and happier around you, and you will be reducing the amount of negative interactions she will have with you. If you need some help deciphering parrot body language, Barbara Heidenreich has an excellent DVD about it on her website:
www.goodbirdinc.com. You can also learn more about ABA/Positive Reinforcement there. Another great site about behavior and how to avoid bird bites is:
www.behaviorworks.org
It sounds like things are going really well for you and Echo right now! So glad to hear that you're socializing her during her critical socialization period! That's important!