what are you looking to get out of a closure session? (keeping in mind I am thinking of a single session, not going back for a few sessions to wrap up what was left unfinished). One session will generally only be enough to review what progress you had made, and/or what went off track. If it wasn't really a good fit and you left because therapy wasn't helping you, then I don't see much point in going for a "goodbye" session (You could get that done via a phone call or email). It is a bit daunting that she will be closing her provate practice and you will never get a chance to go back and work on stuff left unfinished with her. Keep in mind though, that you can find another therapist who may provide a better working relationship, and you could address the stuff that you still need to work on...
Like I said, I'm a big fan of closure and "goodbye's" but I guess you have to look at what you are trying to accomplish with it. If it's for your piece of mind, give it a shot. If it's just to tell her all the stuff that went wrong, then maybe not so pressing to do? Had you had any plans to go back to therapy with her at a later time after your abrupt ending?