One Half from the East by Nadia Hashimi

Obayda’s family is in need of some good fortune, and her aunt has an idea to bring the family luck—dress Obayda, the youngest of four sisters, as a boy, a bacha posh.
Life in this in-between place is confusing, but once Obayda meets another bacha posh, everything changes. Their transformation won’t last forever, though—unless the two best friends can figure out a way to make it stick and make their newfound freedoms endure.
Nadia Hashimi’s first novel for adults, The Pearl That Broke Its Shell, was a bestseller that shares a bacha posh character with One Half from the East.