Has anyone been wait listed and then accepted to the boarding school after? Is it possible? Or, if I ever DO get a wait-listed, should I just consider it as being rejected from the school?
Yes.
Let’s not worry until/if it happens. But if it does happen, and you get other acceptances, you should love the school that loves you back and send in a deposit to one of those schools. You can certainly accept a WL spot, but the odds of getting off it are never good.
@kxmkxm there are a few good wait list threads. And @PhotographerMom added to one thread about being prepared for possible wait list scenarios, but yet I can’t find it now for the life of me…it was an excellent read (I’ll try to keep looking for it if work doesn’t get too crazy). Hopefully, you won’t need any WL/rejection preparation, but it would’ve been a great thing for us to have been prepared for last year.
Here you go! http://talk.qa.collegeconfidential.com/prep-school-admissions/1300302-the-wait-list-p91.html
@buuzn03: It’s pinned to the top of this forum page. 
@ChoatieMom I think I was looking for the post from just a week or so ago that referred to the preparation/plan B. Work got away from me today, though, and I never got around to searching it.
@buuzn03: She posted it on 2/16 on The Wait List thread pinned to the top of the forum. The same one she linked in post #3.
But I would agree that it is hard to keep track of @PhotographerMom.
Thanks @ChoatieMom !!! I knew I hadn’t hallucinated! @kxmkxm definitely look at that thread & @PhotographerMom ‘s post on February 16. It is a hidden gem…