Yes, "Sheila" is a colloquial term often used in Australia to refer to a woman or girl, so an "Aussie lass" could indeed be described as a "Sheila." The term reflects Australian slang and culture. However, whether a specific person named Sheila is Australian would depend on her individual background.
Ernesto Lass goes by Lass.
Lass'
A lass is glass
Barbara Lass's birth name is Barbara Lass-Kwiatkowska.
A Lass
Lass is a noun.
Aussie Aussie Aussie Oi Oi Oi is a chant or cheer at sporting events!
Great Briton
The opposite of lass is lad, which refers to a young boy or man.
In Welsh llances means 'lass'.
lass = la muchacha
Aussie is in Australia.