i found this in a review site
I love the forum buzz right now about who the woman timelady was! The imdb (never really all that reliable) had it posted as Romana, before it was changed to The Woman a few weeks before airing!!! This makes so much more sense to me than his Mum or Susan. Romana becomes President, only to be deposed by the C.I.A. who ressurect Rassilon. Rassilon ? the secret head of the C.I.A. inside the Matrix a la Peter Davison era comics from the DW Mag ? found that that was the only kind of immortality it was right to have without becoming corrupt. To be placed in the flesh would send him down a path of evil. This is why he laid the trap he did for those wanting immortality in his tomb as shown in the 5 doctors.
it seems they claim that the idea was this was a deposed lady president romana, when out of desperation near the time wars end, rassilon was ressurected to lead as romana was failing, it makes sense because a couple years back at a comic con, RTD confirmed that romana was the leaderduring the time war as canon...