Question 1 = option 1 as she is already distressed being separated from her new born baby and seeing her baby via a video call can bring her comfort and help ease her mind.
Question 2 = option 2 as Sarah may need emotional support with how she is feeling. I would ask for permission first if she would like to talk to me. Equally I would respect Sarahs wishes if she requested that she wanted to left on her own.
Question 3 = option 2 I would explain the the reasons why it is not advised that she discharged herself from the hospital.I would also see if she had ant=y family or friend that she would like me to contact to come and support her. Also I would try and make a plan so that Sarah feels that she is more connected with her baby, this could involve more video calls. Also if there was a chance that Sarah could maybe transferred to the hospital that her baby is art so that she can feel closer to her baby and start to bond.