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Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

In "Edge of Tomorrow", Rita Vrataski (aka "Full Metal Bitch", "The Angel of Verdun") narrates how, after the Battle of Verdun, she lost large amounts of blood. After a blood transfusion she lost her power to "reset" her day, which only happens when she dies. How did she find out that she had lost her power? How did she find out for sure without killing herself?
Output:
How does Rita Vrataski find out that she lost her power to "reset" her day without killing herself?