Recommend me some games for my sister

Adventure games (the longest journey), rpgs (terraria?, KAG?), my sis loves NFS series, etc.

Trine 2, Pid, Deponia

Never played it myself..but it seems great for a 13 y/o girl:P

Rayman Origins and Rayman Legends comes to mind. It has co-op too, but I think it's shared on one screen.
Portal is another one.
Scribblenauts games
Lego games

Secret of The Magic Crystals, Fortix 1/2, Orcs must Die 1/2, Trine.

Idk I guess dishonoured and metro last light :3?

My little sister enjoyed Little Inferno, Sonic All Stars Racing, Scribblenauts, Ticket to Ride, Lego games. She's 13 too and was not a gamer at all, was just trying to have quality time with her brother. ahhh, good time.

The lego games

what about the Tycoon series?
i would recommend RollerCoaster Tycoon 3

Giana Sisters? Bit. Runner 2?

What about some simple games like Farm Frenzy / Diner Dash / Cake Mania/ Go Go Gourmet / Build a Lot

Starbound,Terraria,Vox, Blockland,Don't Starve,One finger death punch,Epic battle fantasy 4,Awesomenauts,Bioshock?

Definitely must play

Trine
Trine 2
Little Inferno
Thomas Was Alone
Don't Starve (maybe)
Dust: An Elysian Tale
Guacamelee

Anyway, serious recommendation from my side is Bastion.
Doesn't have much in the way of crafting/building aspects, but is very pretty, plays well and isn't that complex unless you start activating the self-imposed challenges.

Everyone who says they are a girl on their Steam profile usually has a thousand hours in DOTA2, TF2 or CS, or some other FPS like CoD. So try one of those.

This.

Someone going to recommend this anyway

Planet Explorers.
Seems like a good game, you can download the demo for her from their website before buying.

One of my girlfriend's younger sisters, who is about the same age as yours, played Scribblenauts, Costume Quest and Stacking (all 3 per my recommendation). Maybe also 'gentle' point-and-click games, like Monkey Island or some such.

Binding of Isaac.

Assassin's Creed series
Prince of Persia series

Pixel Junk Monsters,
Bit Trip Runner,
Book Of Unwritten Tales,
Deponia,
Cave Story,
Defenders Quest: Valley Of The Forgotten,
Dust: An Elysian Tail,
Fez,
Ghost Master,
Giana Sisters: Twisted Dreams,
Rayman,
Costume Quest,
Any Lego games,
Monaco,
Reus,
Scribblenauts,
Spiral Knights,
Tiny & Big: Grandpas Leftovers,
Trine,
Vessel,
The Whispered World,
Wizorb,
Any of the Ys games,
Awesomenauts,
Lilly Looking Through,
Castle Of Illusion,
Monster Loves You,
Oozi: Earth Adventure,
Violett,
point & click,
& hidden object games,
Sonic,
Thomas Was Alone,
old sega games classics,
platformers are good for that age & puzzle games,

i would not suggest Dont Starve, Terraria, or Starbound. they are complex & hard games with heavy crafting involved.

id suggest trying out some demos for games first & seeing whether she likes the game or not. then purchasing it. good luck on your list :)

Your arguments are valid.
Terraria or 2nd part of that game but i can't remember it's name.