Normally I would say they will be back for the dinner party but I'm not so sure this time. After announcing that she is staying out of any drama, what is the point of her being there. If she gets into it, she's gone back on her promise and if she doesn't she has to just sit there and take it.
She's not willing to listen to advice, she's pissed off that others are declaring their love and Scott isn't and she is terrified that Bec will bring all the receipts, not just snippets of the conversation.
She has no-one in her corner and then she has to face the ixperts again. I don't think she can do it. Her and her puppy might be gone for good.
Or that could just be wishful thinking on my part.