My DD1 has been in speech therapy for over a year, it took a while to actually get a firm diagnosis but I was told that often trying treatments helps highlight the actual issue based on the response. It was always presented as normal not to have a diagnosis straight away and that it wasnt neccesary to begin solving the issues. Nothing really changed for us by having a reason, our speechie just trials and errors different strategies to see what works and it is often more related to DD1s personality than her label.

We were instantly comfortable with our speechie though so trust your instincts.