This is your therapy; she's not the boss. Nor can she feel what you're feeling, so she may not get how destabilizing or hellish this is. If she has arguments for why exposure therapy would be best in your case, she can present those and you might agree with her or disagree. I think this sounds like way too much too fast. I wouldn't do the recording and playing back if I were you. Just giving you my personal feeling here, but this sounds like retraumatization. Exposure therapy is probably great for fear of spiders. Seems like a potentially dangerous idea when applied to trauma.