DAKAR, Senegal — Much more is riding in the backseat of Amy Ndiane’s chic neon yellow cab than the occasional passenger. A Muslim woman, 30, who supports two kids from the fares she negotiates, Ndiane is an official, supported-by-the-president “Taxi Sister” — one of the select few female cabbies in Senegal. “I heard there is a woman in the United States who drives a taxi,” mused Ndiane, a former data entry typist. “For Africa, this is a first, for a woman to have a taxi.”