The Parish wouldn’t have known she was having infertility issues unless she told them. She could have simply said that they were hoping to start a family (not a lie) and wanted to know the maternity benefits. I know many women who simply tell way too much info about their lives. Keeping certain aspects of one’s life private has a respectability to it. IMHO.
You don’t think she talked with anyone about it? Maybe she’s like those women you know?