Momma can be spayed now. It is no longer neccessary for her to be feeding her baby. Most babies are gone to new homes at 8 weeks and as long as the baby stays with the mother she is continue to feed. Is the baby eating by herself? If not it is time to teach her. Also, yes it is possible for her to be in heat this soon after having a baby. I am sure other will give other advise but I would suggest you make an appointment and have Bella spayed A.S.A.P.