My 77 Year Old Mother Missed The Last Stair &

My 77 year old mother missed the last stair & fell and had been hurting in her lower back. She is doing much better but had not had a bowl movement in almost 4 days. She eats natural foods to help regulate her bowels but not even a suppository helped tonight. What can she do? Is the fall related to the constipation? Is taking pain meds (Bayer Back & Body) contributing to the constipation? Thank you in advance for your response.