That's really tough, Luke. I've never met Julie and haven't any idea of what the relationsip between the two of them is usually like. You could not have stuck up for Julie, and you couldn't have said anything to Julie in front of Jane, not without talking it out with each of them first.

Is it possible that Julie kept her back to Jane as a way of giving her and you privacy? If so, would she be able to express that to Jane? To you? In general, do they have good will for one another? If not, there is nothing you can do. Even if so, you can't place yourself in the middle, only talk to each of them and possibly pave the way for them to talk directly.

Good luck.