Hermione was in no hurry to contradict the other witch. Though she knew she should miss Ollie terribly, sometimes it was so much easier to not even think about him. Compartmentalizing her thoughts was sometimes the only way she was able to carry on with the nasty business of living. She knew she was too critical of her own failings as a mother at times. If she allowed herself the freedom to dwell too much on what she left behind in her haste to get away from the bloody mess she made of her husband, she struggled to keep from running back. Her son very likely wished that another woman was really his mum, but she still had a responsibility to care for him.