My first post - sorry if I’m the wrong place. I have a 70+ year old jade tree which is growing in the floor of my beach cottage - I’ve had it for 3+ years since owning the house. A few stems have fallen off here & there, but today when we arrived a large part of the trunk was falling off - it’s soft and mushy and has green mold on the inside. I can’t move the tree. I can’t change the soil. I haven’t watered it since September. Any suggestions? I’d feel awful if it died under our care. Here are some photos of the branch that fell off and is mushy. Thanks!