I think when someone close to her comes out (either Jocelyne or Carla disclosing,) she’s going to be more primed to handle it well this time.
There’ll be a lot of questions, but I think Joyce has had a lot of growth and that will help – her religion is already straining to a near-breaking point, she’s definitely siding with ‘I love you and will support you even if I don’t Get It yet,’ and the knowledge that it’s her one sibling who’s supported her and Becky so thoroughly/the cool girl who helps her just because she can is going to mean Joyce picks a side very quickly.
(That said, it’ll go way better if it’s private, particularly in Jocelyne’s case. A really basic explanation and then Joyce asking questions is going to help in the moment, and that is definitely not gonna happen if Carol’s there.)
(I tend to think it’ll be Jocelyne first, but Joyce knowing about Carla will speed things up dramatically and if it does come down to Joyce finding out with the parents then that’ll help. I tend to think that story’s going to be someday when we get to the holidays? Joyce is definitely not inclined to visit home again any time soon, so Jocelyne won’t show up unless she visits IU.)
Dumbing of Age