The time of death can be fairly accurately estimated by the fact that none of her meal had left her stomach and passed into the duodenum. The pro-guilt claim that this isn't an accurate way to determine time of death - however, this is because you do not usually know exactly what time the last meal was. In this case there were multiple witnesses that Meredith started eating around 6pm. 4-hours would be the absoulte limit, but 3-hours or earlier is the more common time for this to start.
Also from 9:58 there was unusual activity on Merdith's phone - a call to a bank beginning with A and a call to voicemail, which suggests that someone else was in charge of her phone (possibly someone who couldn't read English and was trying to switch off the phone) - at 10:13 the phone received a picture message from a tower that did not usually connect with the cottage, but would have connected with where the phone was found the next day and would imply that the phone was now outside of the cottage.
Meredith also didn't engage in any of her usual activity when she got home that night. She sent no texts, didn't call her mum back, didn't take her clothes out of the washing machine, didn't take off her jacket, didn't open her computer and send e-mails - all indicating she was likely killed shortly after returning home
If they start watching a film at 9:26, which runs until 9:46, it really doesn't give them much time to fit everything in - and seems to strongly suggest to me at least reasonable doubt.