My sister needs to get Medical power of Attorney over her daughter that is on life support in Florida, we are from Georgia.

My condolences to your sister and the rest of your family. This sounds like a terrible situation. Your sister will not be able to get medical power of attorney over her daughter if her daughter is not conscious and able to sign the appropriate document. Your sister needs to pursue a guardianship - possibly a temporary one. A guardian, in Georgia, is a person who has the legal right to make decisions for an incapacitated person or minor regarding that person's physical well-being. Your sister needs to consult an attorney who deals with guardianships. One complicating factor is the different states - your sister may need a Florida attorney if her daughter was a Florida resident, and the guardianship may then need to be transferred to Georgia once the daughter is moved here.