It does not appear that the girls know when she ate.
And neither do you, but it doesn't prevent you from speculating about what the "girls" did that night and when they did it, including an assertion that they "probably" didn't watch the end of their movie.
One of the minor things that makes me cringe about this hideous case, btw, is that Meredith spent the last evening of her young life watching such a deeply sappy movie. My own daughters thought it was good when they were about 14 and 16 . . . but if you haven't seen it, take my word: it's sentimental, manipulative garbage. That said, the last few minutes of
The Notebook are supposed to be the payoff for the whole sad experience. The end is why people watch it, so I'd be interested in what exactly has convinced you that they got bored and stopped it.
One thing we do know happened that evening is that Meredith ate, and we know that some of her meal consisted of the famous apple dessert. Bits of that dessert could be identified at her autopsy. We know from the same autopsy that none of her meal had been digested enough to leave her stomach at the moment she died. One of the "girls" testified in court that they had dessert about an hour before they left. You don't seem to believe her, which is also interesting. Why not?
We also know that Meredith began her last walk home at about 8:45 pm, and that she made her last attempt to phone her mum 11 minutes after that.
That's what we know.
When Meredith was putting on her jacket to go home, then, Amanda was at Raffaele's, talking with his friend, Ms Popovich, and learning that he wouldn't need to give her a lift to the bus station after all.
Then -- 14 minutes
after Meredith's final phone call home, the film Amanda and Raffaele had been watching --
Amelie -- ended. It was 9:10 pm.
So we have Meredith in her flat with her full stomach and her undigested, eaten-at-7:45-pm dessert just before 9 pm. That makes it 85 minutes since dessert at 9 o'clock, unless there is a sound reason to believe that the "girl" who testified to when they ate was off in one direction or another.
We have Amanda & Raffaele's movie ending at 9:10, and Raffaele downloading a cartoon 16 minutes later, at 9:26 pm.
Undigested dessert, eaten at 7:45 pm.
TOD?