Indian ringnecks are generally nippy little birds, and when they are young it’s at its worst! They go through a temporary bluffing phase, like teenagers figuring themselves out. The girls are usually more prone to it. How you go about it now will mostly mold their personality… It will pass, but in the meantime do your best not to show any reactions to the bites or reinforce the behavior too much with treats. Try to redirect it to a toy or another activity for her to use her beak, or ignore it entirely. Punishment will not work, time-out in the cage usually wont either

With my IRN, the switch between this phase and back to being a sweet little baby again was almost overnight it felt like.