But if her illness was under control why the need for it at all? Maybe June knew she was heading for another breakdown! Hence the conversation? Just a thought?.
It's possible that June was projecting. PERHAPS it was June who wasn't coping. Perhaps she was voicing her own fears. For a woman with her own mental frailties to cope with, having two small, boisterous boys and their lethargic mother to cope with, in the middle of harvest, upsetting the balance of her routine, would, I imagine, have been difficult.