Now, please take into consideration that what follows is just my theory about what happened from the time that Rainbow Dash returned to Equestria until the time Pinkie Pie left there and came to live with me. I don’t know exactly what happened, this is just my best educated guess. For those who might ask, no, they never volunteered any information, and I hadn’t thought to ask.

Considering the time I spent with Pinkie Pie, and all that I learned about her during that time, in addition to what I’ve read and heard about the fan fiction My Little Dashie (which, considering my own personal experience, I’m completely willing to take as fact), my guess is that Rainbow Dash returning to Equestria after the time she spent with her human must’ve been a period of major adjustment for her. I’m guessing that efforts to remove her memories of her life in the human world, assuming they were attempted, must’ve proven unsuccessful.

Now, the ten years I spent with Pinkie Pie have shown me that she really cares about her friends, and especially about Rainbow Dash. And, seeing her blue pegasa friend struggling to fit in after being raised in isolation by a human from foal-hood must’ve been especially hard on Pinkie Pie. So, knowing what she’s like, I wouldn’t be surprised at all to find out that’s exactly what happened, and that’s why she decided to ask Twilight Sparkle to use on her the spell that the purple unicorn (alicorn?) had used on Rainbow Dash.

Naturally, such a request coming from any of the element bearers, especially considering the effect it had already had on Rainbow Dash, would not be something Twilight Sparkle would’ve wanted to deal with. It was no doubt enough that the bearer of the element of loyalty was struggling with the aftermath of the spell, and her life with her human. Twilight Sparkle wouldn’t have wanted to deal with the effects the spell would have on the bearer of the element of laughter, or, for that matter, any of the other element bearers.

Knowing what I know about Pinkie Pie, I'm guessing she would’ve been very insistent on being the object of the spell, so she could know exactly what her pegasa friend had gone through, and would have the best chance of helping her.

I have to wonder if Twilight took the matter up with Princess Celestia, as she most likely wasn’t sure she’d be able to handle the matter on her own. If she did, then she’d most likely write it in a letter, that or take a train to Canterlot to bring the matter to the daytime princess personally. I’d imagine there was a council held among all the alicorns at the time, whether Twilight Sparkle was one of them or not. And, Pinkie Pie must have been part of that council, considering she was the one with the proposal in the first place.

Who knows how much time would’ve been spent arguing, negotiating, and trying to dissuade the pink party pony from following what they no doubt saw was a very dangerous course? But, eventually it was agreed that Pinkie Pie be allowed to go to the human world, on a quest to experience all that her blue pegasa friend had experienced, and to find a way to help her readjust to life in Equestria.

Please note that the part about experiencing all that Rainbow Dash experienced is theory on my part, based on how Pinkie Pie reacted when she found out her experiences were different from those of her friend.

From what I’ve read in letters from the princesses, letters which arrived in my bedroom where I'd originally found the pink party pony, I’m guessing that it was agreed that, as long as circumstances allowed, Pinkie Pie would be granted seven Equestrian days in the human world, and learn what she’d need to do in order to help Rainbow Dash. And, considering a fit she’d thrown when she realized that her experiences had been not exactly like those of her rainbow-haired pegasa friend, I’m guessing she wanted to have the exact same experiences that Rainbow Dash’d had. And, you know, while she did go through many of the same things Rainbow Dash went through, and the outcomes were very much the same, I want to make it clear, in fact I will make it clear, that I treated Pinkie Pie very differently from how Rainbow Dash’s human had treated her.

Another thing. Considering all that’s happened, I wouldn’t at all be surprised if it was designed that I receive the bearer of the element of laughter. I have had experiences, and I’m sure I’ll continue to have them, when I got what I needed exactly when and where I needed them. And, I wouldn’t be surprised to find out that Pinkie Pie had that same sort of blessing. Were these events governed or otherwise influenced by the God I serve? Was it all Celestia’s doing? Or, perhaps they joined forces on the decision. Whatever the case was, I received the pink party pony, I’d say not even a year old, on Christmas Eve, about twenty years ago.