IMO it would be prejudicial if jurors saw it. She says Victoria died on 11 January, which is the day before she bought the petrol. The way the Daily Mail puts it is suggestive of murder, which she is not accused of. I know "kill" can also cover manslaughter, but to buy petrol and then kill someone afterwards has certain connotations.
She said in her interview that she considered burning the body but couldn't do it.
It could be that the prosecution will accept a date of 11 January for Victoria's death, given that she bought petrol on 12 January.
Also it could be that she wanted the petrol for cooking in the woods. But I think that's less likely. They seem to have been more into eating sweets, which keeps you awake but doesn't give you much nutrition or fill you up. They were perhaps not so super-skilled at living on the run as was suggested during the manhunt.
As for the bins outside the golf club, IIRC the defence counsel challenged a witness and put it to her that the couple she saw may not have been CM and MG. Since it's being reported that two sets of footage show them rummaging through the bins, I guess it's now accepted that it was them.
I haven't seen the video, but if these were large steel bins about 2 metres high as they probably were, I suspect they may not have been looking to take things out but rather investigating the idea of putting Victoria's body into one of the bins.