Zodiac: Tiger
Four pillars: Geng Yinnian, Ugly Moon, Ugly Day and Bing Yinshi.
Eight characters: Geng Yin is ugly.
Five elements: Jin Mu, Tu Tu, Tu Tu and Huomu.
Yin Na: pine, cypress, wood, thunder fire, thunder fire, fire in the furnace.
The Lunar New Year and the Chinese Zodiac are based on beginning of spring Day that year, which is February 4th this year in beginning of spring, so your niece is a tiger.
The eight-character sun column is for one's own life, the five elements are short of water, and the sun column is strong;
So I like to think of God as gold and water. It is suggested to name it after the Golden Water attribute.