Guardianship of Minor child

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My husband and I are guardians of a newborn baby. We took the baby from the hospital and still have him. The mother (and baby)are a blood relative of my husbands. The birth mother is a drug abuser who was incarcerated at the time of the baby's birth. She was forced to either find a home for her baby or let it go into the system. Child Protective Services agreed to let us have total guardianship of the baby. We signed papers with CPS and our attorney and took the baby home from the hospital. The birth mother had another child 3 years earlier. The child tested positive for drugs at birth and they took the child from her. She was unable to pass a drug test for a year so she gave up her rights to the child and he has been adopted by another family member. My question is: how much right with her past does the birth mother have to come back and take the baby. She is still incarcerated, but next year, will she be able to just come and take her baby from us?