It seems like your mother might be having some sort of gum infection that is being manifested in the form of bleeding. For temporary relief, she can start using Rexidine M gel twice a day for a week. She can also use a mouthwash like Rexidine 0.2%, twice daily, after brushing for 2 weeks. For the pain, kindly visit a dentist nearby.
Next Steps
Deep cleaning and polishing
X ray for the painful tooth