I fully believe Ahsoka’s whereabouts during events of the original trilogy will be cleared up at some point. Dave Filoni and the Rebels team did make sure that the other two Jedi characters, Kanan and Ezra, were safely out of the way before ANH. I’d love Ahsoka to have been on some kind of spiritual journey for a higher purpose, called away by the Force simply because it isn’t her destiny to help Vader see the light again, but Luke’s.

If we don’t get any kind of explanation like that, yeah I’ll be pissed too.