The Pure Gold Baby by Margaret Drabble
Anna seemed like a normal baby when she was born to her unwed mother Jess. As she grew, she seemed ultimately happy. She was the type of child who glowed from within. So when Jess realized that Anna wasn't normal, that she'd never learn to read or do math, she decided to do everything she could to protect and care for her. Despite this, her mostly abandoned career in anthropology continued to hover in her periphery.