Ok, I’m a big Regina fan, but even I didn’t feel sorry for her at the end. Yes, she helped Snow and Emma. But let’s get real here. She destroyed everything Snow held dear. She killed her father and nearly killed her husband Charming. I love that Regina saved them in the end, but inviting the person who destroyed your life over for dinner would be ridiculously OOC for the Charmings.
Yes, we also have to remember that Emma and Snow just returned and don’t know what’s been going on in Storybrooke since they’ve been gone. (Not that they should have invited her even if they had known she’s trying to change, but still, they’re not fully aware of what’s going on with Regina like the audience is.)