If you are concerned, what's the danger in contacting a SLP? Even if they assess and recommend no course of action, you will have piece of mind for the price of a SLP session or two. If they assess and recommend action, you've caught something and that could be life-changing. If she ends up continuing to stutter later on in life, you may feel regret for not acting sooner. I first received speech therapy while in grade 4, but had issues for several years prior. In hindsight, it would have been nice if my parents were more proactive like you, but they eventually recognized I needed help and I'm grateful for my subsequent years of therapy.