Stuttering

So my 2.5 year old in August has started to stutter within the last month or 2. Shes very smart and can repeat just about anything just how it was said but, recently shes but having a hard time getting the words out. Sometimes will shut her eyes and try to get it out. I notice it alot around bedtime and nap time but, she has also been boycotting naps at least 4 times a week so Ive been noticing it much more. She has her 2.5 year apt in August and I plan on bringing it up with them. Ugh...shes my baby and it worries me. Anyone elses 2 years olds going through this.