Yes..'older' girls do lay less eggs coming to later on the year. Mine are now moulting and stopped laying altogether and don't expect them starting until Feb/March time.
If yours have full feather covering now and they don't moult, I suspect you keep getting some amount egss throughout the winter, but once the spring is in full swing, they will lay more eggs than you can handle.
You could 'force' them laying with lighting..but really it would be best that your girls will take it naturally..there is reason for winter 'break' and it is for them to able to catch up with their 'health' and get into better condition..being ex batts, they propably need it too.