Hey all, so here is my take on it, it was a confusing episode, but at the same it does make sense with the way rtd writes, so stay with me, it will make sense by the end, keep in mind this is just a theory and knowing rtd he will either never reveal or reveal something completly different that noone could ever guess.
So the start, no old lady right ? Wrong, it's revealed that there is some sort of perception filter around the old lady, but unit are trained for this, the fact that they all ran, means that it's something way stronger than a perception filter, but who would have this power, this is series that rtd came back in to fix, not ignore but fix what Moffat started, hence why rtd used the toymaker, the return of rtd, the return of the toymaker, the toymaker isn't actually a bad guy, well he is but not in the grand scheme of things, are you a bad person for killing bacteria to clean your kitchen? Same kind of thing applies, the toy maker and the toymakers kind are not from this universe as we've already discovered in the original dr who and now the new one, the toymaker simply wants one never ending game, but thats not right is it, well think about the dr, from another universe according to Moffat, wants an endless adventure, always goes looking for it, always creating it, ever meant a child who can find a ball when there is no ball?
So, now we've established the dr isn't the only multi universal being playing around in this universe with an obsession for a single thing e.g, games, music, adventure, back to the old lady and what she said... did you see the black cab that Ruby's mom left in, its a real black cab in London, just google the reg number, ll12 eef ( I think that's it , hard to remeber now, but 12 is significant here, it was the final season of the mat Smith Dr, the final incarnation of the old laws of the Dr, 12 regeneration came to an end in 2012 and a new immortal Dr was introduced, in 2012. New beginnings, new origins, see where I'm going with this... the old lady was ruby however, not in the way you think, ruby doesn't know her birth mom, she was left at the orphanage, but by who, this is where theories come in, ruby... being the orphan and the Dr's new pet, is one of these beings, just like the dr, just like the toymaker and so on, with an obessesion for belonging. She always wants to belong and becomes frustrated and lashes out when this doesn't happen. She wants to belong in her life, and in time, to always belong in time would be the ultimate belonging. Wether ruby knows this or not is unlikely at this time, who knows, maybe she has a picket watch. As for what she said
A little science, we live in 3 dimensions. This is known, but its wrong, time is the 4rth dimension we live in, you step forward, you move across a horizontal dimension, jump, vertical dimension, grow fatter, the dimension of depth, but we age and get older, the dimension of time. The beings don't exist locked to these, same way your not locked the 3 dimensions but you are locked to time, your only locked to the final dimension you are able to access, that is your boundary if you will. Old lady ruby didn't say anything to the people she scared, she showed them time, in particular what would happen if young ruby didn't stop mad Jack, she left her self a clue in the scrolls, remeber she can jump through time and space at will, like a portable ( more portable, stable, controllable tardis. Old ruby showed them the death and destruction through nuclear war, this terrified them, old ruby showed her adoption mom the concept of Ruby's death, the loneliness human ruby would feel, all the things a mother, adopted doesn't matter, she's still Ruby's mother, all the things a mother fears the most, and she showed all these people who to prevent it, by shunning Ruby. She showed Kate not only all this but also told her just how powerfull she could be, allowing for anger and fear, Kate was left with no option to ensure the survival of well, everything really. The lack of control angered Kate,
OK a lot of anger here right, well there's a point to that, ruby, is not just one of these beings, but basically a feeder, she helps create the emotions and feelings that these beings require to feed, music, she's in a bar when the dr meets her first, anger will be another one of these beings we've yet to see. All at the same time of forfilling her own need for belonging, belong to a group, create the food within that group.
So what about the fact she wasn't there at the start as the old lady, the fairy circle, all of these beings are sealed away and use things to enter our universe, the devil's note, a child's toy, a fairy circle that nothing belongs in, when it broken Ruby's being was released, and the first thing she did, created a time loop scenario in order to ensure she always belonged, save the world, you will always have a home on the world, who belongs more that someone who saved the thing you belong too. Is ruby evil, no, she just wants to belong. A primordial sense of belonging.
That's my theory on it anyway. I could be way off, only time will tell, in our future, in someone else's past, at some point, time revealed all
Sorry about my spelling and grammar, that's not my strong point