I was thinking about the topic.
Sala I think she is not mestiza, instead pure native american.
The whole concept about "mestizos" is normally related to low class in other countries while in Argentina they are the oligarchy because here the King of Spain encouraged his men to marry local native american women so, it is at the Conservative and extreme right parties were you probably find more "mestizos" because there you find those last name with remote colonial roots. At the officialism (the administration in power right now) is where you can find most mestizos with last names like Bullrich, Aranguren, Urtubey among many others.
While the immigrants like you and me are their natural enemies.
However, they do not recognize their selve as mestizos and, instead, they developed the pseudo theory os an argentine native superior raza through Zuloaga:
So, this is what the extreme right thinks in Argentina.