If she had any sedation such as midazolam or valium, they could be responsible for the lack of memory. 80% of people who have sedation don't recall anything of the entire day of the proceedure.

Having said that, I recall *all* of the day of my c-sect. Even the bit when I was waking in recovery. The only bit I have no knowledge of is the bit where I was actually knocked out just after DD was born.