The games are an alternate universe and what Geralt does is based on his death/resurrection experience plus the events in the following games.
Triss absolutely tricked Geralt and is flawed because of that.
But she never interfered in finding Ciri since she only comes back in the Third Game.
The books are not an alternate universe. The books are the entire backstory and foundation.
Triss is not just "flawed". Triss is a horrible person for doing that. Imagine if you had a wife, lost your memory, and then some fling from the past manipulates you and prevents you from actually even knowing about your wife. Not only that she even steers you away from recovering your memory out of complete selfishness.