This story is a sequel to From Filly To Mare: A Scootaloo Story
The story starts with a rainstorm. Rarity spots some old box outside, and investigates. She finds a crying filly inside, named Sweetiebelle. She raises Sweetie from sad, lonely filly, To an adult, and strong mare. What will become of Rarity and Sweetiebelle? Only this story will tell...
Why are your chapters so short?
Sweetie Belle. Smaller numbers should be written as words, not numerals. Also, I'd recommend brushing up on your dialogue grammar, as there are some issues there.
Those few grammar issues aside, the writing was overall decent. Unfortunately, the snippets are short, and we can't really see how they've shaped Sweetie Belle. If she died at seventy, you've got about twenty words per year of her life... The story needs to be more. Longer chapters, and more of them, so that we get a better sense of who Sweetie Belle is and who she is becoming, and how the events of the past have shaped her.
It's Sweetie Belle with a space like Apple Bloom