Healing Fire by Angela Castle

Melor, an elite warrior of the planet Kell, has come to Earth and the city of L.A to find a Protected to call his own, but all the women reject his attempts to court them. Dejected, he decides to return to Kell, but an earthquake sends Melor through the portal and right into the path of an oncoming car.
Summer Rose, a widow, lives near the Humboldt Redwood Forest of California with her daughter, Blossom. While driving home late one night, she hits someone with her car.
A powerful attraction pulls them together, but when he tells her he is from another planet, Summer is convinced Melor is crazy. Melor is determined to heal the pain of Summer’s body and heart, and prove to the stubborn woman that he is not crazy.
When Melor is captured, Summer and Blossom fight to get him back to Kell and back into their lives, forever.