I mean lets be honest here. What the fuck is she going to do about it?
She's in another world not many ways of getting back I would imagine. And if she could return, why would she? she has started dating her favorite person, and has an entire group of friends that won't judge her for who she is.
I say fucking forget about them and just focus on your new life.
Now with all that being said, it's nice to know she has the best parents in Japan, who accepted her. I hope they don't miss their daughter too much.