Gill teaches an undergraduate senior seminar course and graduate courses in applied animal genomics, quantitative genetics and molecular biotechnology. Her primary research interest is in developing efficient molecular tools for comparative genomics. She is also the principal investigator of the McGregor Genomics Project, which is a collaborative effort to map genes for production efficiency in cattle.

She was awarded a chancellor's letter of commendation from Flinders University and the AMGEN Australia prize for excellence in biotechnology research. She has twice been a finalist in the Young Australian of the Year awards for outstanding achievement in science and technology. Gill also serves on the technical committee for the bovine genome project and is a member of the International Bovine Hapmap Consortium.

Gill is a member of the International Society of Animal Genetics and the American Society of Animal Science.