If its not neurological bcs you say you have a history of stuttering, then yes you caused if bcs of the constant correction. See stuttering comes bcs your brain subconsciously stops you from speaking. So what could have happened is that she developed the stutter from fearing saying the wrong thing like "i need to". Thats my honest thought so unless its neurological yeah, its completely your fault and you broke her. Suggestion? I don't suggest speech therapy at her age esp bcs it started recently. Speech therapy will only make it worse or long-term bcs she will see stuttering as something bad she should get rid of and stuttering is sth that gets worse the more we fight it. I suggest you stop the correcting and speak to her with patience and encourage everyone at home to do so. Also dont act negatively to the stutter. it will go away after a while and if it dont you should now consider speech therapy