Has she been spayed?
Is there any swelling of her vulva area?
Is it bright red discharge?
Normally a female discharges for about 3-4 weeks after birth so she should not have discharge at this point. I would have her checked out just to be on the safe side incase there is an infection present. I am almost wondering if maybe she is starting her heat cycle again. They can cycle every 4-6 months. :) Go ahead and make her an appointment with the vet for a check and let me know how you make out. :)