Lorna Bucket Returns But Younger?

I was watching Series 6 and a huge potential flew right into my head. I thought how on Earth did I forget this? If you cast your mind back to Series 6 "A Good Man Goes To War", we see a young looking woman called Lorna Bucket. We quickly learn that Lorna has had an "encounter". Meaning she's met the Doctor himself. But which face? Has Lorna already seen the 12th Doctor?

Where is this leading?

My theory is that Maisie Williams is playing Lorna Bucket. Is Lorna coming back to our screens finally? We've seen Lorna on screen once, but we know Lorna and the Doctor have met in the Gamma Forests, where they ran.

The Doctor looks shocked to see this (familiar) face in the Series 9 Trailer because he says "you?" as if he's seen her before. It's almost as if it has been a long time since they last saw each other. If it is Lorna then, the Doctor remembers her from the battle on Demons Run. Has the Doctor returned to the Gamma Forests to see Lorna, or has Lorna summoned him about something? Or is it just a coincidence?

Look!

If you look in the background of the photo (above) you notice what appears to be trees in the background. Is that the Gamma Forests? No it can't be? Wait, maybe it is. By the looks of things Maisie is riding a horse, people ride horses through Forests, what about Gamma Forests?

For all we know, the Doctor has met Lorna more than once and promised Lorna that he would return. Is this him returning to her at last? Hints the line "What took you so long Old Man?"

This is the perfect opportunity for a character to return but in the past. Don't get me wrong, I probably waffled on, none of it made sense and it's all wrong.

Wibbly Wobbly Timey Wimey Stuff.