Can Green Card holder parent who lived outside US in 2019 be my dependent?

My mother - who is a US Green Card holder - lived with my father in their own home outside of the US for the entire 2019. My mother and father are married to each other. I financially supported my mother during 2019. While my siblings (who live in the same country as my mother & father and are citizens of their own country) also supported my mother, no one else in the family claim my mother as a dependent. I am the only sibling in my family who is a US citizen/resident and file US taxes. My mother is a homemaker and has no income in the US or in her own country.  She has never filed US income taxes.  Is my mother - who is a Green Card holder - considered a US resident for tax purposes even though she lived the entire 2019 outside of the US? If so, can I claim her as a dependent? If so, how do I enter this into TurboTax Premier?