Looping and dissociating are naturally protective things your brain does during EMDR. It's actually a good thing, so be kind with yourself and give yourself some patience in this. There are no right way or wrong ways to react to EMDR, your brain will take on only so much as it is ready for. Your T is probably right, she needs to slow down a bit and maybe target the memory or feeling from a different perspective. I've been here many times during EMDR work. I've been doing EMDR for over 6 years. It is scary sometimes but my T allowed me to progress at my own rate. Sometimes it takes many sessions to break through. Your brain naturally knows how much it can take at once, so allowing this to happen at your own pace, whatever it may be, will eventually allow you to trust more and more going to those areas and keeps you functioning outside of therapy too. It sounds like you are doing great work!