The inconsistency isn't an accident or a flaw in the writing, it was done deliberately. We are shown that the vision affects everyone slightly differently, because they are all individuals - look at Narissa's reaction compared with her aunt, the one rendered left insane to the tune of destroying a Borg cube while the other remained functional, her reaction to the vision focused inward and channelled into purpose. Why is it so hard to believe that while the vision damages everyone, that damage manifests in different ways for each individual? If Oh and Narissa were able to recover enough to function highly effectively as undercover agents, why shouldn't Jurati also recover control of herself after the horror of being driven to murder? In the universe of Star Trek, I have no trouble believing that she was compelled to commit that murder due to the effect of the mind meld, but then the shock of committing that act was enough to shake her out of it afterward - it is no less believable than anything else that has ever happened in this franchise!