If you want to make sure that your child is provided for in a stable environment, file a custody suit and ask for temporary orders which give you the right to set the residence of the child.  Work with a family law attorney to develop a plan and presentment of that plan to the court so that they will know that your environment will be best for the child.  If she has no plans to actually take care of the child, then this will be your best opportunity to seek custody as some courts are reluctant to remove such a small child from the care of it's mother.  At the very least, the court will set parameters on what it expects of her as a mother.  If she does not fulfill the obligations set by the court, then you will have an opportunity to amend the orders laters based on her failure to comply with the court's orders.