Human girl Amanda Honey Bagen was simply taking a walk when it takes a turn for the worse, and she ends up in Equestria. Not only is that bad, but she has also become a pony. And can't find a way back home. (After the events of season four and Rainbow Rocks)
Honestly, this isn't much of a start. So far, it's basically identical to hundreds of other "human becomes a pony" stories that have been posted here. You're going to have to find some way to make this stand out, or it will become just one more drop in the ocean of Human In Equestria fanfics.
Great story