12-year old daughter with lisp...?

Since she's already 13 and still speaks with the lisp, its highly likely that she'll have it (to some degree) for the rest of her life. If she's not willing to take the speech therapy cl, then she'll just have to learn to live with her lisp. One of the other. She's old enough to decide that on her own. Personally, if it were me, I'd talk to her about it and just tell her point blank that she either tries to do something about it or learn to embrace it. You can't be embarred about something, then refuse to do anything about it. You know what I mean?