Denied access to school due to the Taliban’s failure to reopen secondary schools for girls, one Afghan teenager has taken to the Internet to try to exercise her basic right to an education. But her self-driven online learning mission has not been easy. The morning Rabia H.* watched her younger brother set off for his first day at school since the Taliban came to power was a difficult one for the Afghan teenager. School reopened a month after the August 15 Taliban takeover, and the 15-year-old Kabul schoolgirl had already endured the most traumatic period of her young life. Days after the August 31 US troop pullout, Rabia’s father fled…