One of the most important elements in the practice of trauma sensitive mindfulness is the freedom of choice in your meditation and mindfulness practice.  In certain schools of meditation training, especially those arising from monastic traditions, a great emphasis was placed on "sitting through" difficult emotional and physical states in order to have some kind of spiritual breakthrough.  While this can happen, we now understand that for some people, and for all of us sometimes, it's not a wise choice.  

What we now understand is that when our meditation practice pushes us out of our window of tolerance (see below), it's important that we know what our options are and how to work with the situation. 

For many people grounding in the body, tuning into the senses in the present moment, choosing mindful movement or walking meditation, listening to music, or stopping meditation and seeking out soothing activities  are helpful alternatives to sitting meditation when we are triggered. 

For each individual it's a territory of exploration.  We don't want to jump away from our practice any time discomfort arises, but trying to practice outside our window of tolerance is often not productive.