i just got an idea: if Twilight would stay in the human world for some time, learning new things and all, its very likely that she encounters human Sweetie Drops, who, without the secret organisation to fight magical creatures, didnt have to change her name. and since Twilight is a smart pony, she would figure out that Sweetie Drops is also a pony in Equestria, and when she returns home and encounters pony Sweetie Drops, Twilight would most likely use this name when talking to her (as in walking by her in a café and saying "hi Sweetie Drops"), starting some confusion and maybe a little argument between Lyra and Sweetie Drops. then Twilight would have 2 options:1: go nuts because she doesnt know whats going on.2: explain that she knew her name from another world, reachable through a magical mirror in her castle.both ways would be totally hilarious.