Sudden stuttering in my 2 yo
Totally normal at this age - brain is working faster than she can articulate most likely - be patient and don't draw too much attention to it other than perhaps to help her slow down... if it continues and you feel concerned go ahead and get an eval from EI before she turns three (it's free) but I'm guessing she'll be fine in a few months - this is pretty classic actually...
It is common for it to come and go - so you may notice that she stops for a week or a month, and then has another recurrence. This is normal. It may also increase if she is tired or stressed. If she cannot get words out, is becoming frustrated, and/or if you notice it's starting to involve facial muscles (grimacing or a tic) those are red flags.
It really freaked us out when our dd started doing this - talking with a few professionals (an early interventionist and the SLP) was really helpful - calming. Good luck to you!