NITA BHALA UNTIL the new coronavirus hit Kenya in March, 17-year-old schoolgirl Anna believed the world was hers for the taking. It didn't matter that she lived in a tiny shack with her mother, who single-handedly raised three children by washing clothes for 1,500 Kenyan shillings ($14) a week. With strong grades in English and chemistry, the determined teen aspired to finish her education and become a television presenter. She would buy a house for her mother and support her sister and baby brother through school. Now, four months pregnant, Anna sits on the edge of the bed of her…