This just a shot in the dark but did she have a spinal or epidural during delivery?  I have heard of people not only having a headaches right after the delivery with these and even longer like months longer.  Maybe she could talk to her OB/GYN about this to see if he would have an opinion.  By the way I have a little boy with the same name but we spell it Cayden he will be 3 in October!  Good Luck Carrie!

Dana