How did Rita realize that she has lost the power?

She said that due to another human's blood in her system she lost the power. But this doesn't explain how she was aware of the fact that she has lost the power. As to realize it you have to die and never wake up.

merged by Napoleon Wilson Nov 13 '15 at 10:15

This question was merged with How does Rita Vrataski find out that she lost her power to “reset” her day without killing herself? because it is an exact duplicate of that question.

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