Was there an event that caused the onset of her stuttering? A sudden lapse in fluency seems peculiar. If she has only been stuttering for 2 weeks, and in consideration with her very young age, a second opinion from a certified speech-language pathologist may be helpful. Also one note to make is that a child's dysfluency may be developmental, and up until around the ages of 7 to 9, children can "outgrow" their developmental stuttering (for lack of better terms). Meaning that her diagnosis is by no means permanent at this point. As for treatment, one effective treatment program that has more research evidence than any other treatment approach is the Lidcombe Program. This is especially purposed to treat toddlers and young children. Also be aware that not all speech pathologists are familiar with treating developmental stuttering. Most SLPs only receive one course in the treatment and assessment of stuttering during their graduate studies, and seeing client's with developmental stuttering on their caseload is not as common as one may think. I would try and find an SLP that works at a private clinic that specializes in stuttering, or an SLP that has a lot of experiencing working with developmental stuttering. Another great way to find an experienced SLP is to go through https://www.stutteringspecialists.org/search/custom.asp?id=1972 They include a list of board certified specialists in your area, though board certified specialists are not very common.