After the journey to SA for an international tournament ("Grannies International Football Tournament") at the beginning of April it seems to have gone downhill. In SA Karen met her husband, and she consulted a lawyer because of their joint property. When Karen was accompanied by JFG, who was also on this trip, afaik we didn't learn. Maybe, JFG was Karen's support during the lawyer's visit.
When Karen with her granny team returned to her second homeland France, she searched for a new home, opened an own bank account and filed for divorce. At the same time, her health and fitness seemed to suffer more and more, as friends noticed. When Karen appeared without make-up to an event, a low point had been reached - in my eyes anyway, and in the eyes of friends/acquaintances it was remarkable at least.
From 5/6th April (returning from SA) to 29th April (the murder) less than 4 weeks passed, and Karen was brutally stabbed by night, when she returned from a wine-tasting. What did she and JFG fear to possibly might happen on her way home? Why did they both arrange a call from Karen to JFG as soon as she would arrive home? I think, there was already a serious threat, that frightened Karen (and JFG). So sad, that Karen probably felt only safe at home and already had arrived at her doorstep.
Then a cousin in Tremolat tells the husband in SA, Karen may be dead, because someone on Fb. had posted it. Exactly, I would tell this unconfirmed drama to a loving husband, who never thought of notable marital problems or a divorce. Sarcasm off.