Hi ! I'm glad to say that I've got it working. The fix from Cupcakestastelikeviolence didn't help me as it seemed more like a bug then a conflict and I was about to write the whole thing off.
Then I remember that I had this same issue a while back with my sims not being able to play the guitar. They'd get it out, they'd chose the song to play then the action would get canceled. But it only happened in one game.
So, it dawned on me to test the doll in another game in a different world ( Yes, I am that slow as to only think of it :) ) and sure enough the doll works !!! I had to restart my current game with the Sim I wanted to play and the doll worked there as well.
Thank you everyone who tried to help or tried to cheer me up or both. :)