Who do you think she is?

mother. If you read enough on the internet you find out that's who she was meant to be

She's the Doctor's mother or lover. She is clearly someone very dear to him. So close that he can know what she wants him to do without anyone saying a word.

I think she was the one person on the High Council that realized their fate was sealed. She somehow was able to forsee what Rassilon would try and also knew that the Doctor and Master would be the sole survivors. She had very special abilities even for a Time Lord.

oh gosh umm she looks like an older sharah jane smith

yup The Doctors mom I mean it makes sense.