That's the single most stupid thing I've ever seen in this manga, how fucking dense is the MC? She knows people are out to get her, she knows demons are incredibly easy to rile up, and then her own fucking demon guard throws a bitchy jealous tantrum to run away and when she comes back with a sneering grin the MC just welcomes her in? Are you kidding me?
Fucking tell the Demon King, tell her siblings, tell fucking ANYONE in the whole goddamn world that gives a shit that your OP and JEALOUS demon guard is JEALOUS OF YOU AND POTENTIALLY WANTS YOU DEAD?!
Dear God, I bet in the next chapter they'll just make up and be friends too.