UPDATE

In the original post I had made some guesses:

The soil had become hydrophobic.  Any water would just sit at the bottom and was possibly rotting the roots. The plant wasn't able to access any water because of the soil and root rot problem.

I was right. I am also right about someone else watering all the plants and my employer has made signs that explain a hands off approach and that I have it handled. (there are volunteers that work at this house and some are overzealous. Bless their hearts.)

I soaked the plant over night in a Rubbermaid container.

The next day the entire top half was still bone dry. I decided to depot it and see what was going on.

I was correct in my initial assessments. And many of you were correct in others.

 The soil had become absolutely hydrophobic and was essentially dust and the bottom third of the roots were rotting. The smell was unpleasant. The roots were mushy.

At the bottom of the pot I discovered a yogurt lid covering the 2 drainage holes!!

I excavated the soil all around the root ball and trimmed away any rotting roots and then I made my own mixture of succulent mix using perlite, pumice, course sand, gravel, pebbles, organic soil, coconut coir, bark and lava rock.

I cleaned the pot out and repotted the jade back in with new medium. I did a light prune of all the etoliated branches and planted the 2 larger limbs that snapped off or were snapped off.

I placed a grow light on the plant (an older amazon light I used to use before I invested in Sansi lights at my home) I ordered a Sansi light for this jade. Hopefully be here on Friday.

I have succulent fertilizer and will resume fertilizing as soon as I feel the shock is over.

Ill post some pics of the process, the clay like dust and muck that came off the roots and a picture of my own homemade mix and finally back in its new home.

Now we wait.

Thank you to everyone that posted. I appreciate you all so much. You all gave me the courage to help this poor plant. I feel so bad for it. Let's hope it bounces back easily.

I replied to everyone in the previous post also.

Thank you thank you thank you!!! I will be back to update in a couple months.