Hello Rita,
You are right! Your little bird is probably molting (new feathers coming in). She might also be in need of a bath. You can either spray her with a water bottle a couple times or offer her a bowl of water to play in. I usually bathe my bird a few times a week...it also keeps their skin from getting irritated. Just make sure it's not too cold when she bathes.
You are also right about taming her and you have the right idea and attitude! Spend as much time as you can with her; this will help her to bond and trust you. A great way to get your bird to trust you is to talk, interact/ handle (as much as she allows you to) with her as much as you can, offer her little treats or toys, and give her space when she doesn't want to be bothered.
There are not very many books about Indian Ringnecks unfortunately. If you need anymore information I'm happy to offer any help.

I think it is great that you saved the little bird, I’m sure she'll be very happy with you! Good luck
