I believe it was suicide. It was done in a dramatic way because she felt completely trapped emotionally. I think the best way to try and determine what happened is to look for overall patterns. The one overriding pattern I see is Rebecca's isolation after Max's accident. All the kids are whisked away, dog boarded up, she's not allowed to visit Max, there's a possibility that she's staying in the guest house, I think Adam was instructed to watch over her, and she jumps from the guest room. We know that JS is a very controlling person. We know that DS did not trust Rebecca. After the tragedy of Max's fall I specualte she was blamed and cast away by both DS and JS. She may have kept this to herself adding to her isolation. This is why her dying words were she saved him - she did not allow Max to die at the scene. It wasn't her decision to take him off life-support and she would have been against that. I speculate that JS and DS made the call to take Max off life-support and that the decision wasn't made or transmitted for the first time at 12:50AM. We will never know the content of that VM and that makes everything that happened afterward impossible to understand on it's own.
'Can he save her' was a message to Max's soul. We know she believed that taking her own life was against God's will and she was asking Max for salvation. We don't know exactly why she bound herself the way she did but it could have a very intimate nature - something that will never be made public - and that will always seem confusing to the public. This is the most challenging aspect of this case if it was suicide there will be certain information that will not be made public. It seems that most people that believe it was a murder have to rely on the possibility of additional evidence that's not present. I think it would help if those that really believe it was murder organize their arguments in order of priority. What is the number 1, 2, 3 etc... fact that makes you think it's murder? It would be interesting to see which issues rise to the top - which ones are shared by everyone - which ones are outliers. My hunch is that there will be little convergence. You can look at any one aspect of this case and it will seem suspicious - but if you try to build an actual case there's no consistent path. Again it's always about patterns. Again if this is indeed a suicide there may be patterns about Rebecca privy to JS and others that will never come out.