Committing zina with one's autistic brother

Q: When my friend was 10 and 13 she tried committing zina with her autistic brother. She believes that at the time she didn't know what this action was. Her brother has been tested to have no sexual fantasies. She believes that the penis did not penetrate the vagina, which means this is not intercourse. She has repented and 100% knows she won't do it again. She still feels guilty, does she have to leave home, where would she go? She doesn't want to reveal this to her family. 

Status of our currency

Q: What is the status of our currency i.e. rands and dollars? Is it thaman (money) or mabee’ (sale commodity)? In other words, what is the Islamic position on fiat money which is the currency of the majority of the world today? Some say that it is haraam and riba as the money of the Quraan Majeed and Sunnah is gold dinars and silver dirhams which have “intrinsic value”, while today’s money is backed by interest. What is the proof in the Quraan Majeed and Sunnah?