[It's not entirely surprising, Rei did seem like an introvert, though one that could be charming when she wanted.]

I can make you card that say 'My Mental Health Takes Precedence in This Situation' and you can hand them out to people and walk away when you need to.

[She's not even making fun of the issue, this is her genuine solution! An extrovert can help an introvert by being considerate and watching out for their friend's health! That's the idea, anyway.]