I do not think that Kira is based on Rosemary from The Giver. They do not seem to have a great deal in common.
I would say that Kira has more in common with Jonas than she does with Rosemary. Kira, like Jonas, is entrusted with a task that is really basic to the survival of her community. Kira, like Jonas, comes to feel that her community's way of life is oppressive and wrong and willingly breaks away from it. She does so knowing what the consequences will be. So far as we know, Rosemary was not like this. Rosemary chose to be released, but she did it because she couldn't handle the memories, not because she disapproved of the society and was trying to change it.