How could Lydia stand to remain ?
I don't know what else should can do, but her mother snuck into the Kingdom and she is a raging psycho, and she said nothing.
Hell, the Colonists ought to hang her on suspicion alone, or give her a cell next to Negan.
I would never trust Lydia. And after getting those people killed how can she stand to face the other colonists?
This is not written believably in remotely any way.