Mrs Evans, 23, has spent three-and-a-half years fighting for the right to remain in Springfield, Brisbane, with her Australian husband Steve and their young son.
She ran into problems after a routine health test for visa applicants because her body mass index - calculated by comparing her weight with her height - was considered "extreme".
"When they do the health checks, they do your height for weight, and if it comes out too low, obviously they don't take into consideration anything else," Mrs Evans told Australia's ABC news.
"It's just if you don't match their figures, you're out, basically."
Apr 21, 2006
Too skinny for Oz
British woman faces deportation from Australia because she only weighs 95 pounds.