MAGGIE MICHAEL EIGHT months pregnant, Malaz Omar left behind everything to flee with her husband, two toddlers and an elderly aunt from the fighting that has swept across Sudan's capital for more than two weeks. By the time the 34-year-old arrived in Egypt, she hadn't eaten or showered for four days, passing through the Qustul border crossing where people slept on the ground and had nothing to cover their heads from the scorching sun. Her plight reflects that of thousands of others who have paid high prices to journey north to Egypt on buses and trucks, only to get stuck…