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Fantasywriter: "Is 'mummification' really what happened in this case? "

definitions of mummification:

1. To make into a mummy by embalming and drying.
2. To cause to shrivel and dry up.
v.intr. To shrivel or dry up like a mummy.

So there's no other word for it.

"Schweitzer did the opposite of what most paleontologists do with their specimens.
Instead of preserving and protecting it, she destroyed it by soaking it in a weak acid.
If the entire fossil had been made of rock, it would have dissolved completely.

But in the terms used in Schweitzer's paper -- co-authored by Jennifer L. Whittmeyer, John R. Horner and Jan K. Toporski -- the acid demineralized the specimen.
After seven days, the demineralization process revealed several unexpected tissues..."

The mummified material was soaked for seven days to bring it back, so to speak, to life.

Oops; no soaking required:

“If this is not already enough, Schweitzer recently made an even more startling discovery. About three years ago (2002) she and her team had to divide a very large T. rex thigh bone in order to transport it on a helicopter. When the bone was opened flexible soft tissue “meat” was found inside. This is incredible because this bone was supposed to be some 68 million years old. Microscopic examination revealed fine delicate blood vessels with what appear to be intact red blood cells and other type of cells like osteocytes - which are bone forming cells. These vessels were still soft, translucent, and flexible. Subsequent examination of other previously excavated T. rex bones from this and other areas have also shown non-fossilized soft tissue preservation in most instances.54

This find calls into question not only the nature of the fossilization process, but also the age of these fossils. How such soft tissue preservation and detail could be realized after 68 million years is more than miraculous - - It is unbelievable! Schweitzer herself comments that, “We may not really know as much about how fossils are preserved as we think.” 54 Now, if that is not an understatement I’m not sure what is.”

http://www.detectingdesign.com/fossilrecord.html