(((((xRavenx)))))

I agree that the friendship seems unhealthy for you.

It seems that this last meal was similar to the previous one: she evidently got upset about something and has chosen not to tell you what it was.

With regard to whether you should contact her: there seems to be a pattern here. She repeatedly has difficulties in her relationships, and she gets mysteriously upset after seeing you. How much are you willing to accept these behaviors from one of your closest friends? It seems that they will continue.