Her Christmas tree was covered in gaudy, with tinsel and glitter balls everywhere.

gaudy 是形容词，意思是"花哨的、俗艳的"，通常用来形容颜色过于鲜艳或装饰过于夸张的事物。这个词带有轻微的贬义，暗示装饰品味不高或过分炫耀。