Carbon Copy

Kaylee Green was an Illegal Alien, one that had traveled 45.7 light-years to get away from her pursuers. A race that wanted to exterminate her kind.
Not only was she an alien, but she was not entirely biological. Now, she was enjoying life as a human. She had recently graduated college and was happily living with her human boyfriend.
Then the police show up asking about a severed hand from a six-year-old cold-case investigation. They want to know why her fingerprints and DNA both match the hand.
She was trying hard not to panic. Her carefully crafted false identity was rapidly falling apart. What else could go wrong?
The answer was that unexpected visitors from the planet she fled from were about to arrive.