Hear me out but like batfam x neglected pinkie pie reader?. She’s very much different to the batfam, being they were dark clothing and not really bright outfits (Stephanie) and her upbeat energetic personality, always wanting to party and make people happy. Well some of the family members mistake her for trying to spend the money with mindless parties being pinkie pie only wanting to help orphans with parties and help fund raisers. She always helps Alfred with chores, when she bakes sweets and put them in the fridge it always went missing when she always puts her signature cards to not eat them, she always tried to brush it off saying they were hungry. Before Bruce adopted her (do you know Gypsy bard from friendship is witchcraft?) basically in the song happened to her, being her bad habit of brushing off her trauma and only wanting to help others then herself. She gets out the house (which they don’t know she walked out) and she gets a job at metropolis being a helper for mr and Mrs cake at their bakery and she meets her friends and have a grand ol time.
The usual cupcakes, brownies and sweets in the morning weren’t there and they say to Alfred why he didn’t make the sweets anymore and he said “you realized too late because my hands haven’t baked sweets in ages” then they realizes that there was always a pink card with balloons on it.
As someone who didn't watch much my little pony when I was younger, 100% you got me. This is like incredible. Anon, this is so detailed and well thought out, it's wonderful but I really think you should write it! You're clearly very imaginative and creative! (Might still write something for it anyways, but it'd probably be a one shot since I'm not that familiar with MLP lore.)