This story is a sequel to Our Girl Scootaloo 2 of 3
Just as a lonely man once found a filly Rainbow Dash, so did a tiny Scootaloo turn up in the backyard of a loving couple with no children of their own. Years later, Prof. T. Sparkle, Ph.D, writes the official biography of this-particular-Earth's first Pony citizen, with instructions to 'talk to anyone you need to and don't censor anything.' Rated T and now 20% cooler.
Part three - the 'rescue' mission
Now twenty years after her arrival, Scootaloo has grown up, gone to medical school, and is working through her residency with the paramedics at her alma mater. With her husband David (and the help of medical research) she has given birth to two adorable young foals, Sophie Belle and Chaya Jayne.
The world in 2033 is significantly different because of her presence; hundreds of millions of people have survived terminal illness because of treatments reverse-engineered from her DNA, her ability to fly is understood and ships using her ElectoMagnetic Field Repulsion Drive leave weekly to support the fledgling human colonies on Mars and the moons of Jupiter. This and hundreds of other technologies, from the spectacular to the mundane, can all be traced to the willing volunteerism of Earth's first Pony citizen; yet Scootaloo manages to live as normal a life as can be expected for a doctor in residency, wife, MedEvac doctor, new mother and extreme-sports enthusiast who also happens to be the world-famous, well-beloved first of her kind who many regard as having personally saved the world. (Yeah, she thinks it's completely weird, but it mostly works.)
From the perspective of the Mane Six, it has been only three weeks since the accident that stranded Rainbow and Scootaloo on different human worlds, and one week since they 'rescued' Dashie from her adoptive father's home outside Detroit. Rainbow and Dashie are still sharing a body after their memories failed to combine properly, though they have at least stopped fighting with each other... most of the time.
But now Celestia has found the world Scootaloo was sent to, and will be departing with the Mane Six to 'rescue' her, just as she did at the end of 'My Little Dashie'.
What could possibly go wrong?