Originally Posted by wizzywick:
“But the person the OP is referring to wasn't a friend of the Doctor!”
Well the character is female and described as an old friend, so that rules out quite a few people.
I don't think it could be Susan or any other relative of the Doctor as it seems odd to desribe your relative using the term 'old friend'. Also don't think it could be the Rani as she is definately not a friend of the Doctors.
Off the top of my head the only two people that are both female, have the possibility to have a new face (regenerate) and are an old friend and of the Doctors are Romana and Donna.