Hi - SLP chiming in. It's true that some SLPs don't have a ton of experience with stuttering (fluency disorders are relatively low incidence compared to other speech and language disorders), but many SLPs who work in early intervention do. Many university clinics and private practices also have SLPs on staff who have particular interest or experience with fluency disorders. You can always just ask if there's anyone who specializes in fluency (the medical term for stuttering, cluttering, and a couple of other disorders). There isn't really a formal nationally-recognized certification in fluency, unfortunately. To echo what bethegood said, little kids repeating whole words is normal. BUT, repeating any word/sound/phrase more than 1-2 times is not typical at any age. The other thing that stuck out to me about your description of her stuttering is that she gets noticeably frustrated by it. This alone warrants an evaluation. Obviously this is just my reddit 2 cents from the bit of info you provided and not a medical diagnosis, but I think you're really doing her a great service by getting her services early!