It's time to take a look at this app - and hope I don't hurt my eyes, staring into the proverbial sun!
First off, I very much like your allusions to the fate of her parents; as there's almost zero mention of them in the series itself, I am quite satisfied with leaving their fate nebulous like this.
The app itself is solid... and the typos I see, I can fix personally.
I will say that there should be a bit more after the gathering of Twilight & the Mane Six; I would at least advise to continue the background (important events only) up to & including Starlight switching her & Luna's cutie marks; maybe another paragraph alluding to her sister's return as well. It almost feels like the history stops right before the events of the show itself - we don't need another six pages, mind you - just a few show highlights.
Once you've gotten a chance to go over things, let me know what changes you make, and I'll happily cast my gaze into the sun again!