What type of colonic are you getting? How well hydrated are you? Do you know how much water the colon hydrotherapist is using during a session? And...do you know what she meant by 'letting your body do most of the work'?
At 3 colonics...one a week...you should have passed a whole bunch of waste material! Mucoid plaque generally does not release in significant quantities from colon hydrotherapy alone...it takes an intensive colon cleansing program in order to get this old gunk out.
You may need to find another colon hydrotherapist...tell me more and perhaps I can assist you.