Liddle is known for her research of history of Delhi including its architecture and buildings, and food. Liddle is an art curator. She advocates people's participation to help preserve heritage. Liddle was the convener of the Delhi Chapter of Indian National Trust for Art and Cultural Heritage (
INTACH) previously. She contributed to
The Delhi College: Traditional Elites, the Colonial State, and Education before 1857 and edited
Sair-Ul-Manazil. ==Books==