McGarrett's Daughter

Amelia was a normal girl. She had always known she was adopted but her parents loved her and that was enough.

One day, she comes home to find her house broken in to. She calls the cops and they inform her of her parents death. She is unaware of any of her parents living family and realizes there is a good chance she will be put up for adoption.

However, investigation in to her birth parents reveal who her birth father is. And despite not knowing he had a child, the cops tell Amelia he is eager to meet her.

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Agent Greer betrayed her country in favor of a payday. When she was caught, she sold out the members of Steve McGarrett's SEAL team. As a result, many of his friends died. She was a villain until her death, when she was killed by Catherine Rollins.

But before that she did care for her country. She cared for Steve. And though that love did not last, something else did.

Steve McGarrett and Meredith Greer spent two days in a run-down motel in Marrakesh. Afterwards, Steve was deployed and left Agent Greer. But those two days resulted in a nine month pregnancy and an adorable little girl.

Meredith Greer never told Steve about his daughter. Instead, she put that child up for adoption. A family in northeast Georgia took in that baby girl and Greer never looked back.

Now, years later, that girl come home to find her parents murdered. When a DNA test reveals that child's parents, she is forced to leave Georgia and go to live in Hawaii with her real father.

(I couldn't find anywhere in the series where is said Agent Greer's first name, nor was it on fandom wiki or anything. I put Meredith, but if anyone knows her real first name please message me and let me know what it is!!)