After reading some posts about having an updated or newly certified Kor Dor 2, I got her indoors to phone Nonthaburi Immigration and ask them. They require a Kor Dor 2, it can be the one I used for previous extension, no need to go to the Amphur for another one.

It is actually called khor rhor 2, well you could spell it differently, but it is with an R not a D.

But thanks for your report, will be helpful to others using this office.