The problem is that you just can't separate all these factors. The media pressure and the off-court distractions all play a factor in this. Of course it doesn't matter in the exact moment she's serving or playing but it's already too "late" then, it has already influenced her in the lead up to the match.
She simply doesn't have the same on-court attitude anymore that she had 16 months ago, she went from generally happy/positive and mentally strong to annoyed/pissed and mentally weak...for whatever reasons. Looking in from the outside it is of course impossible to tell which of the factors discussed contribute how much to these changes but I'm sure they all play a factor more or less.
The world around her has changed a lot (the media going from favorable to lot of pressure, media spotlight due to her private life, more off-court stuff) and it has dragged her tennis slowly but steadily down... there's no denying that.
So imo, as important as changes to a game are changes to her mindset, she needs to find that focus, pleasure & joy in tennis again she displayed 16 months ago. If she can't get that state of mind back, all the coaching in the world won't get her back to the top. That sounds like a lot to ask given that she's in a slump but the interesting thing is, she is still happy and relaxed off court... it just seems to go away once she starts playing nowadays.
She hasn't become a different person but she needs to change her on-court mindset more than anything. I was really shocked to see her this pissed and annoyed against Mchale from the very start. There's no excuse for this, she had a week of lead up to the tournament, the golfer was there... there just wasn't any reason to not enjoy it a little. But she can't anymore, for whatever reason.
These are all good points, but each player has a lot to deal with.
I can go down the list. I'll give a couple of extreme examples.
Safina was #1 and started having back problems. Instead of taking time off, she tried to hold the #1, now she's off the tour with a bad back.
Sharapova had surgery on her shoulder. When she came back, she couldnt serve the way she used to, she had a new compact serve, but still the high ball toss, which isnt a fit with that serve. All the analysts were breaking down the toss & the motion, and her results were very uneven. I remember saying around 2010 that it looks like Pennetta past her. But the shoulder got healthier, she got much fitter, and she fought thru it all, and now she's on top of the world.
Caroline is lucky to come out of all this healthy. She has to work hard, and fight for each point. She should watch her IW match with Sharapova as an example. You have to keep fighting for everything you earn at this level. No other player will give you any gifts. And keep working on your game & fitness whenever you can.
She has to stop hanging around golf courses, unless she still has to week to prepare after golf, because her tennis game is soft, and excuses are for losers. You have to fight thru it.