After effects of fox attack?

4 weeks ago on Saturday we had a fox attack,  since then the ladies have not laid particularly well.  Initially we put it down to shock from the attack but it's now 4 weeks later.  They were all wormed 6 weeks ago; egg production before the attack was on the increase.  I have 4 Light Sussex that only came into POL in January, the others are just over 2 years old (hybrids) so I am expecting their laying to decrease.  The older hens all moulted at the end of last year. 

Could this still be the after effects of the attack or should I be looking for something else?   

Thanks
Melody