Encouraging her to speak and say everything she wants to say is good. Being patient and unbothered by stuttering is good. I don't think you need to ignore it or pretend like it's not there with her, but I understand it can be difficult to discuss when you don't know a lot about it. Stuttering can be a pretty complex communication difference. I used to call it a disorder, but have recently thought that it doesn't need that kind of pathologization. You can be a happy and effective communicator and stutter, but not if you're ashamed of it or try to hide it. That said, many kids around her age stutter. Most outgrow it. If you don't know how to talk about it (which I wouldn't blame you), you can just let her know that she is ok, stuttering is ok, and that you just want to hear what she has to say.