Open CPS case and pregnant?

My cousin has an open CPS case and recently found out she is pregnant. She has 2 kids that have been placed in my care until the case is resolved. It has been 3 months so far. On my placement paperwork the reason listed is " to assure the safety of both children and to be sure the youngest's medical needs are being met". The medical neglect is documented and proven from multiple health care professionals. She (the mother) is bi-polar and doesn't want to medicate. Pregnancy can literally kill her (serious problems with last pregnancy), and yet she's pregnant again. She's quit her job and has no stable home (she bounces from friend to friend). We (her mom and sis, me and my spouse) think the case is pretty solid against her and are praying she doesn't get them back. She needs to get herself healthy and she's not anywhere near that at present. If that happened, they would be adopted by us and she'd still be in their lives. Since the case is currently open and they know she is pregnant again, will they take the new baby away from her and place it with me so the siblings stay together? We've had the background check, fingerprinting, etc that was required to be their safety placement. And if the baby is placed with us, will it fall into its older siblings case or will a second case (with its own time line) be opened to address the new child?