Using a magnifying glass, she examines the Ficaria verna, commonly known as lesser celandine or pilewort, is a low-growing, hairless perennial flowering plant in the buttercup family Ranunculaceae.

Miller is the official plant recorder and invasive species coordinator with the W.J. Beal Botanical Garden and Campus Arboretum. She has GPS-recorded and mapped over 20,000 trees and 50,000 shrubs over the 5,000 acres of the Campus Arboretum.