Adam . no offence but you are wasting your time. The posters who think or believe JB is innocent will also think JM is telling lies. She told the N.O.W that he never admitted his guilt to her and also lied in court about the involvement of the police in her visit to the bank to "admit the fraud". She was paid whilst carrying out the 32 interviews with the police. And even if she was telling the truth later - then like BW she was telling lies in her original statements which tied up exactly with what JB said. Like you said earlier money is a good motive for murder . It is also a good motive to lie.
I don't know , perhaps she did believe he did it and was "persuaded " to embellish the story in order for the police to get a conviction as they had very little left to go on. And maybe then she thought that was morally acceptable. But to keep quiet for a month - that's not morally acceptable in my eyes. Also read what the judge said about her testimony, Apparently she was in such a state that her evidence should not be relied on.