Get the pullet into your lap facing you. Locate her vent. Right beside the vent on each side are two bony knobs. Try placing two finger between them side by side. If they fit, that pullet will lay any time now.
I have three EE pullets 18 weeks old, and their pelvic bones are still so close together, it's difficult to even detect them as being two separate protrusions.
The shortening days are interfering with many pullets the ages of ours beginning layin. If this were spring, and the days were getting longer, it would trigger those laying hormones. Now, it's dubious whether they will lay this season. You and I may need to be patient until after January when the days will be heading the other way.