Her whole body would stiffen, and she would be unable to use Chakra. In the end, she would become like someone suffering from ALS, turning into a rigid human body that fell to the ground, unable to move. At the same time, her mouth would open and she would scream loudly, drawing other people's attention so she wouldn't be left lying on the ground like a stiff piece of cured meat, waiting to die.
Death didn't matter much anyway. They could always bring her back to life. The Research Department had used the Resurrection Technique so often that they had become increasingly skilled at it. The cost of bringing someone back had steadily decreased, and the process had gotten faster and faster.
Still, it was easier to resurrect someone with a fresh body. All they had to do was remove the damaged parts, activate the body, and summon the soul. Resurrecting corpses that had rotted or been burned by flames was much more troublesome.
So, living people were still more useful.
If they wanted to resurrect someone whose body had rotted away, they first had to cultivate a new body. That was a great deal of trouble.
As for why they didn't grow clones or create artificial people for their experiments—
In Uchiha Kazuto's eyes, a being with full intelligence was an independent life, even if it had been cloned. It might look very much like its original, but in essence, it was a different life—and it hadn't committed any crimes.
If it hadn't committed a crime, what was it doing in the Research Department?
In short, attacking the police was also a serious crime in Konoha, one serious enough to land someone in the Research Department for labor reform. After all, if you weren't plotting against the village, why