[EarnestKS]

Despite having indicated that she does not believe there is a god (naudhubillah), she stated her interest in learning about Islam. I don't see how you could start with anything but the message itself - the Qur'an. If Allah (SWT) wills, He will guide her. So I agree that Qur'an and Seerah are best. She can look up events in a Seerah book for context. The Seerah book might also help develop love for Rasulullah (saw). If anything, I think the actions of Muslims around her would sway her against - not the Qur'an and the exemplary life of Rasulullah (saw)... so bear in mind that she is even reading your actions brother!