Daughter was very very close to her place of employment when she said she noticed a "vibration" then a "thumping sound" and then the "left rear part of the car just kinda dropped down"!!! Boy I sure wish she had stopped at the first 'vibration'

Any guess what actually broke? Was planning to replace the camber struts soon because of worm out rubber bushings. Not sure that would cause this....? Thoughts
?

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Dale