My sister and her husband had already attended the first one, last year. As i mentioned a couple of times in a few posts shes trying to get out from the marriage since he has been abusive towards her so she ran away home back to her family and is hiding out from him. They were married about 14 months now, and he is telling her he only got his acceptance letter for green card and there will be another upcoming interview but she doesnt want to deal with it and thinks hes lying to her about it just so she wont divorce him and get him deported. Any Suggestions about this interview thingie?

I don't see how him being so dependant on her cooperation and assistance, he could be on - top of that - be abusive towards her?

He should be working hard and deliver all the money to her and be extra and super nice! Instead, you're telling me, that he's even abusing her? I don't know what's wrong with her (low self-esteem?), but she should not go live with a man like that and get herself hurt or killed. It's only going to get worse, once he has established his status here .

yes, usually there are at least two interviews and for most adjudication cases (based on marriage to USC) the marriage must still be intact. If this person is abusing your sister, she should immediatly divorce and inform BCIS about the failed marriage.

Hes being too nice to her..now that she is gone he is sending gifts and constantly messaging her on the chats..yet still she knows that all hell will break loose if she goes back to him and is afraid to divorce him now that hes being all nice even tho we all know its phoney, i wonder if she can inform BCIS before the divorce and let them know whats going on beforehand

In these situations, if she can not make up with her husband and do not want to live with him, she should file for divorce. On the other hand, if she do not want her husband to get GC then she should write to BCIS to withdraw her petition.
Good luck.