Strange too that JM KNEW about the forthcoming murders. In my books and in the minds of others,she was an accessory.
How many guys are in prison at this moment who were " friends " of those who'd murdered.? It's known as Joint Enterprise. Jordan Cunliffe was accused of this.He didn't touch the victim,he probably didn't know when he set out that night ( unlike JM who " knew " ) that some poor soul was going to be murdered, but being part of the accused is as bad as having carried out the deed.
Knowing someone plans to do something bad doesn't make you an accessory doing something to aid them does.
She said she didn't believe he was actually going to do it though. I had a friend who said he was going to blow up our high school, he never did it though. She treated him the way we treated him when he said such. Jeremy made somewhat more detailed plans that he did and conveyed such plans to her so some say she should have realized he was serious. But it is hard to take people serious who say such things unless you see actual preparations being made like see bombs being built. If she did think he was going to do it bu didn't care that just makes her a horrible person not an accessory. If she aided him in his planning that would make her an accessory.
There is only one area where her actions could potentially have made her an accessory or guilty of obstruction of justice. That related to her support of Jeremy receiving a phone call from WHF. It hinges on what she knew and what her intent was. If she knew Jeremy was making up receiving a call and helping to support a fake call that at the very least is obstruction and could very well make her an accessory after the fact.
She said that before the murders Jeremy told her a call from WHF would be made to him and this would be his alibi. She was vague about whether he would simply make up this call or someone would really call. Her vagueness could be because she realized if she admitted he said it was going to be made up then her support of him receiving a call was aiding and abetting him.
She said that in his call to her at 11:30 he told her tonight is the night.
She alleges at 3AM the night of the murders he told her the murder plan was going well and he received a distress call from WHF and that he wanted her to convey this to police. For all we know he told her he was going to pretend he received a distress call and needed her to say he called her to report to her that he had received this call and sounded very worried. If he did tell her that then she committed a crime by telling police what she did on the first 2 days after the murders.
She initially told police what he wanted her to say. Later she told police that he called at 3AM saying all was going well with the murders and that he received a call from Nevill. She framed it as her failing to tell police everything she knew not actively lying to then. She said she failed to mention the parts where he said he had not been to bed yet, all was going well with the murders, tonight is the night from the prior call, neglecting to mention how he had long been talking about killing the and finally not mentioning his admission he was responsible. She said she didn't lie for him she just didn't tell police everything she knew.
It is hard to see how she could think that a call was really made to Jeremy. It seems obvious he planned to lie and make up receiving a call. She paints herself as stupid and really believing such. People will have lingering suspicions that she knew there was no call and was lying for him but there is no way to prove it since Jeremy won't give his version. Jeremy wants to pretend he is innocent so won't give his account of what he really said to her.