OK, so the "anonymous family friend" first says that Jennifer was discussing the possibility of separating from her husband, and then in the next statement we read that she might have developed an emotional attachment to someone online who may have possibly led her astray.
Now...what possible OTHER context could either of those statements have been in? They both sound perfectly straightforward to me.
I don't necessarily attach what is meant by the 2nd statement (emotional attachment) to the first one.
If the first statement is true (that Jenn was discussing separating from her husband) -- that wouldn't necessarily have anything to do with the 2nd statement. She could have wanted to leave him because she'd found out about his affair, or for any of a number of reasons that have nothing to do with a romantic attachment with someone else.
However, it's odd that the only one person (this anonymous family friend) ever even mentioned that Jenn wanted to leave. Even her husband, who did acknoweldge marital problems, never said Jenn wanted to leave. In fact, he said the direct opposite -- "she would never leave." And there's evidence that Jenn was taking measures to save her marriage and keep her family together, so I think the first statement is quite suspect.
The 2nd statement -- about an emotional attachment to someone online -- is most likely blatantly false. As we have discussed before, there is no electronic trail or any other evidence that points to Jenn being involved in any sort of special relationship with any online friend.