6 year old daughter is stuttering.

6 year old daughter is stuttering. My 6 year old daughter has developed a stutter over the last month. It started with a few words here and there and is now happening frequently. Sometimes she's stuck on the same word 10x before she's able to get it out, multiple words in a row. She does not seem bothered by it. We've been very careful not to point it out to her or make a big deal about it, but I'm pretty concerned. I don't know where to begin or how to approach this, everything online talks about 4 and under it seems. I've booked an appointment with her Doctor to see what he recommends.