Then it brings me back to why would she eat a 1a.
Both my husband and I have been known to eat in the middle of the night if it's stopping us from sleeping.
I'm on some heavy medication where I have to pay attention to my blood sugar constantly. Sometimes I'm too tired or lazy to do this in an evening, and then I'll wake up in the early hours with the room swimming and feeling like death, and I'll have to wake the husband to get me a banana to sort it out.
He's not on medication, but is greedy sometimes wakes early feeling peckish and can't sleep.
Wasn't Reeva on diet pills? I'm wondering if she was also dieting, not eating fully at meals, and then needing to get up and top up in the night. It was hot. She couldn't sleep, being more aware of her physical state in the night she needed to try to pee, she realised she was too hungry to sleep... It might just have been one of those restless nights where she just couldn't get comfy so tried everything.
I'm not saying any of this is definitely what happened. It's just there are three possible reasons why a person might get up and eat in the night.