Originally Posted By: Matter-eater Man
I know it doesn't make sense but I wondered if it could have been Donna. That scene where she's getting married and Wilf asks the Doctor who the mysterious woman was, the Doctor doesn't say anything but looks at Donna. Plus there was the line she said she had been lost. That could of course apply to both Susan & Romana too.


That's the point, though. Wilf asks who she was, and The Doctor looks at his granddaughter. It supposedly implies that it's HIS granddaughter, Susan. But, like you said, it can be seen many different ways...