Answer:
Given that she's a ghost, she probably wouldn't have answered at all.
Step-by-step explanation:
The question refers to a Japanese story from Hokkaido named The Loving Mother. It tells us about Mr. Sakota, a pharmacist, who received a strange visit by a disheveled woman asking him for baby medicine at midnight. The same thing happens a couple of nights in a row which makes Mr. Sakota suspicious. He has a friend snap a photo of her but when they look at the photo, there is no one in it. The final night, they follow her to a room where a baby is crying next to a dead woman who happens to be the mysterious visitor.
If Mr. Sakota had asked the woman why she came at midnight, given that she is a ghost, she probably wouldn't have answered at all but maybe showed him the way to follow her.