Jade Plant Collapse After Overpotting: Fungus Gnats and Root Rot

Classic Overpotting Disaster

Jades have fine roots that rot in excess moist soil. 8" → 12" pot = death spiral.

Remove ALL added soil. Return to 8" pot (or similar).
Fungus gnats (flying) came with new soil. Adults die in a week; larvae go with discarded soil. No pesticide needed.
Bright light. Water when top half of soil dry.

How long roots stayed wet. If rot advanced, plant fails. Time will tell.

Jades live decades in 8" pots. Never "upgrade" pot size unnecessarily.

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