I could be missing a step or in that summary, but I've done it both with her never doing any scenes and with her doing the scene a bunch of times, but only after I eventually stop them from doing it. How many times did you have them "negotiate" prior to stepping in? I can give it another go and test out if there is a set amount of times before scene is lost, but I was under the impression that the scene is only gated by the negotiation scenes (and even then not 100% they are gated at all, might just be tied to large secret).