It's not like Mina will be harmed.
No one can enter her land unless she wants them to (or their mortals)
No divine artifacts can enter it.
No divine actions (Other than her own and her gods) may be used in it.
She can easily escape to a plane with her people if needed, due to her teleporting shadow minions.
She has tons of mythical beings to throw at any invading mortal armies, as well as her own divine oomph.
I'm just irked that she is, for all intents and purposes, impossible to threaten. How am I supposed to present an enemy threat to someone who can just relax at home, untouchable, until they leave?
“She'd become a governess. It was one of the few jobs a known lady could do. And she'd taken to it well. She'd sworn that if she did indeed ever find herself dancing on rooftops with chimney sweeps she'd beat herself to death with her own umbrella.”
― Hogfather