She is a total lab rat and loves her research.
lab rat
idiomA student or employee who spends a great deal of time working in a laboratory.
Since he started his PhD, he has become a complete lab rat who rarely leaves the building.
The dedicated scientist remained a committed lab rat throughout her career, finding more comfort among her beakers and samples than in the outside world.
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poor as a rat
Synonym of poor as a church mouse.
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rat run
A small, usually minor road used by a significant amount of traffic as a short cut or to avoid congestion on more major routes.
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smell a rat
To sense something suspicious.
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winter rat
An old, unattractive automobile, purchased for little money, to be driven during brutal Great Lakes winters while the owner's "good" car remains garaged and protected from corrosive road salt for the season.