Hello Friend , thanks for reaching out here for help. Your problem looks little unique and let me share my views from ayurveda angle. See if help you to understand. While wearing saree there is generally pressure in the stomach region (depends on the wearing style). This pressure is required for normal function in women. However for few women, due to orientation of internal organs the pressure may be cause disturbance in digestion. In a typical digestion process, the food gets first digested at stomach and then reaches intestines. If for some reason digestion is not proper, it can causes symptoms like acidity, bloating, heart burn, vomiting, constipation etc.
Next Steps
You can consult me online to evaluate further as depending on her body type(Vata, pitta, kapha) such symptoms may associate with certain body functions.