This thread is confusing because it is really kind of a follow up to the post the op linked in the 2nd post. This is a good example of when doing a follow up in the original post is considerably easier especially when people read the follow up without knowing the history. Continuity is then preserved.
OP it might help if you go back to your first post when you originally posted the issue of your DD being ignored and put the link to this thread so people who were following that get this update info.
OP actually posted the link to the previous discussion in the second post of this thread. She has also added it to her first post (superfluously) on your advice.
(I did not exactly get your gist... you want her to post a link to _this_ thread in her older post. While a nice thought that would bump up an old thread... plus, continuing drama/sagas tend to get a O.O from me. (No idea how others feel). Kind of makes me wonder if the person with a jillion threads on the same subject has been absorbing anything discussed over time on this forum.)
But even without that link advice as to what an adult child can do is per usual: they fight their own battles with only support and advice from the parents. To have a parent step in to a Marital difficulty or an Inlaw difficulty would be the epitome of a helicopter parent. (unneeded advice... having read sparksals' post wrong)
She linked to her old thread in this post, but it appeared many didn't read it b/c they didn't get the gist, which is why I suggested she go back to her OLD thread with the original story and post the link to this thread so those following that will get the follow up. Since she posted a new thread, people reading this one did not have the backstory, or didn't read it, hence why people were so confused.