In Guardians of the Galaxy we see Gamora's rap sheet say
Origin: Last survivor of the Zehoberei people
However, in Avengers: Infinity War Thanos says to Gamora
Gamora: I was a child when you took me.
Thanos: I saved you.
Gamora: No. No. We were happy on my home planet.
Thanos: Going to bed hungry, scrounging for scraps. Your planet was on the brink of collapse. I'm the one who stopped that. Do you know what's happened since then? The children born have known nothing but full bellies and clear skies. It's a paradise.
Since Gamora's people are still alive, why does Nova Corps have on record that she's the last?