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Michel Koch on Threads on whether ____ survived: "I'm pretty sure it should be the case"
(pricefield.org)
If you were not aware, Michel Koch is one of the two directors of the first game.
An easy way to make sure Kate stays alive is letting Chloe die. Easy fix, hehe.
On a more serious note, while that theory is comforting to hear, I think the beauty of these games and the first Life is Strange in particular is the incredible amount of loose ends it leaves. It's up to you to decide who manage to save themselves or not, that's a different story that the game won't tell you.