If we're both going to transmigrate, why did everyone else become the legitimate daughter of the prime minister, while she became a convict sent into exile?
And why does she have to bring along an unconscious husband and two little children?
Why did everyone else transmigrate before their exile, giving them time to loot the national treasury and private vaults and stock up on food, while she transmigrated on the road to exile with nothing at all?
[Ding! Your golden finger has arrived: an interdimensional supermarket where you can buy anything and everything, as long as you have money.]
Well, how convenient. Every exiled official has a little private stash of their own.
And so Shang Feiwan travels into exile while setting up street stalls, upgrading her pocket dimension along the way until she reaches the place of exile.
She farms and builds infrastructure, turning the desolate northwestern wasteland into the granary of Great Jing.
The emperor gets jealous and wants to take it back. Not a chance.
Other nations get jealous and come looking for a fight.
“Don't worry. Your husband will protect it for you.”