Nope, she IS in the game.
Here's a quick guide. You need a deck with both 404 and Parley cards.
Load up "Woods" map. You NEED to get both 404 and Parley in your hand. Once you have them - go inside the shack in the middle of the map. Use the 404 card and you'll see some text on the wall. After that use the Parley card. Is you see "thank you" on the ceiling you did everything right. This unlocks a secret character "FKF_Dingo". He has a lot of different skins that you unlock for playing him. Play 50 matches as him and you'll unlock Laika

Really? I thought it's a mod

Sure is. Wanna know how to unlock her?

hey is that Laika?