All valid questions.
I personally thought that it was fairly obvious she was a past version based on what little we were told. So I was somewhat taken aback to learn that Chibnall himself didn't seem to know himself.
Which, quite frankly, is taking secrecy on the set to a whole new level.
For a brief moment I was ready to believe that Chibnall had a plan, and honestly, I was there for a previous and forgotten incarnation. Strong hints of The Other.
Alas I think we all know what's coming next...
Foot note: We've all signed up for BuyMeACoffee. Jim will be using his to supplement his reduced income. Ness is going to be saving for a laptop or desktop with his. And mine also exists.
In Print Christmas Special 2023
In Print Anniversary Strip - Hearts 2 Hearts - Part 3
In Print Anniversary Strip - Hearts 2 Hearts - Part 2
In Print Anniversary Strip - Hearts 2 Hearts - Part 1
Re-Introduction to the 'In Print-Verse'