Isabelle received her Bachelor of Science in Occupational Therapy from McGill University (Montreal, Canada) in 1991. Early on in her career she specialized in paediatrics and sensory integration and has been involved for nearly 30 years in developing these areas of Occupational Therapy in Spain, her country of adoption. She has completed an Advanced Practice Certificate in Neuroscience at Thomas Jefferson University under the direction of Dr. Roseann Schaaf and a Master of Science in Occupational Therapy at Virginia Commonwealth University under the direction of Dr. Shelly Lane. She obtained her PhD at the University of Newcastle (Australia), also under the direction of Dr. Shelly Lane. Her research is focused on examining the toileting habits of young children from a sensory perspective.
She has published four books and numerous articles about sensory integration theory and its application in Occupational Therapy and daily life activities. She has taught extensively in many Spanish universities and a variety of continuing education programs for occupational therapists and other health professionals in Spain and internationally. In 2005 she founded the Asociación Española de Integración Sensorial (Spanish Association of Sensory Integration). In 2014 she helped develop and implement the first school-based Occupational Therapy program in Spain; a program that is now being expanded to other schools. She has been actively involved in promoting sensory integration in Europe along with other European SI leaders. She is owner and director of Clínica de Terapia Ocupacional Pediatrica Beaudry-Bellefeuille, a pediatric Occupational Therapy clinic located in Oviedo, Spain.