A page is not showing up at all in the search whereas others are fine

I have an issue with a client complaining that her website, which has existed for more than 4 years, is not showing up as he would like. And to be honest, she is right about that.

She is a real estate agent covering the Los Angeles area in Chile. When searching for "Venta Casas Club de Campo Los Angeles" her website (tierrapropiedades.com) appears fine. In 3rd position, see here, but when searching for a more global phrase: "Venta casas Los Angeles", her website is nowhere to be seen, see here. And there are plenty of pages that should come, such as this global one, or any individual property, such as this one.
I have been reviewing the structure of the page through Ahrefs, checking about just everything that comes to mind using Google Search Console, but I couldn't find what would stop this website from showing up under that search. The cherry on the cake is that another one of my customers is just showing up fine on the same search.

Any clue on what is wrong is welcome.

 

"Venta Casas Club de Campo Los Angeles" - barely any serious competition.

"Venta casas Los Angeles" - you're trying to outdo sites like Zillow, Realtor, Redfin, Movoto, etc. (at least that's what I see in the US).