That is a $100 Question
I would apply EAD in mid Nov or Dec, if by that time her G.C. is still pending.
Worse case, you can walk in to the local INS Dec 29th and ask for EAD. But they will charge you additional $100 for a 6 months temp EAD.
even if you apply NOW, you might not be able to get the EAD on time, so why not wait till Dec?