The Lazurai Returns by J. R. Kruze

She was different - and could be mankind's savior, or it's worst enemy.

The third generation born after a freak accident, her kind were shunned by humanity. Because they meant walking death. Until one human showed her compassion. Then her gifts came to view.

Her parents and their parents only knew death, could only give death. But they only wanted to be understood.

Rochelle was searching.

For the one thing that could save all of mankind from itself.

To find it, she would have to live among them as one of them, in disguise.

As she still could wipe out an entire city through her touch. If she wanted to. But she didn't know what she was supposed to want. 

So she came here, to surround herself with strangers. Some her natural enemies, but maybe some friends. It was up to them, for she didn't really care whether they lived or died.

 But she knew she needed to find out...