Why didn’t she say goodnight to me but everyone else? Sadge?

Well only you can answer this question.

Ask her why she did not say goodnight to you.

How do you know she says it to everyone else but you? Is it via text or face to face? Maybe she doesn't like you. I think you yourself would have an idea why but maybe not. You should ask her or someone she knows if it bothers you too much.

Goodnight.... Sweet dream ..... ❣