first step-cousin-niece

1. The granddaughter of one's parent's stepsibling.
2. The stepgranddaughter of one's parent's sibling.
3. The granddaughter of one's stepparent's sibling.

My first step-cousin-niece is a good person.

first-cousin-4X-removed

First-cousin-four-times-removed (1C4R).

My first-cousin-4X-removed is a good person.