Y'all, I just found a book with similar character names and a similar concept to my book.
It's called Unloved Twin (i think) by tay_bay.
I haven't read it, but I thought it was interesting that, like in my book Twinemies, the twins' names are Aurora and Sophia, and from the description, Aurora is an unwanted twin.
I'm gonna go read it and, I guess, come back and give a review. brb :))))))