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Maybe the exhaust hangers went out and part of the exhaust the pipe is hanging on the axil. When the exhaust is cool, grab the end tail pipe and see if it moves about with a shake. Another possibility is a heat shield came loose and is resting on the drive shaft.
Finally, and I mean no offense by it, but check to see if she has not been driving with the parking brake on; although you would probably smell that one for a while.
Good luck with this.
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