I have had females lock for a year and a half before Ovulating so just because they lock doesnt mean she is cycling or will become gravid. Just keep pairing until you see that Ovy or eggs.
I have snakes that lay in Janurary and snakes lay in October (and every month inbetween) all kept in the exact same conditions. They will go when they want to, sometimes the locking and male interaction will start the breeding cycle so just keep going until you get eggs. I have 5 clutches laid already in 2009 with one hatched. I dont follow a specific routine, I pair year round depending on what my females are telling me and they go when they go.
Best of luck JC:snake: