You didn't cause her stutter. Just scratch that thought out of your head. Of course you broke your child. You'll continue to break her. Every parent breaks their child. Welcome to the club. Her language is still good. Her fluency is suffering. You can't go backwards though. This is a development issue. She still has all of her own words and thoughts. Just as bright as ever. But she's struggling to express herself. Don't focus on it for right now. Be patient. Be empathetic when she gets frustrated. AS A SIDE ACTIVITY... Not as a fluency technique. Not as a solution. Not as a cheat. But ONLY AS A HOBBY spend some time with music and singing. It's a positive way she can use her voice without disfluencies. DO NOT TRY TO FIX THE STUTTER WITH SINGING!!! No harm in seeking out an SLP who specializes in stuttering. But it might be premature.