Visit a physiotherapist.. go for physiotherapy treatment for 10-15 days... It's tail bone pain.. physiotherapist will assess it and let you know proper treatment...
Meanwhile you can ask her to sit on a soft cushion instead of using hard surface for sitting..
Also avoid long sitting.. after every 20min of sitting , take a walk...
Next Steps
also use warm water sit on a tub with warm water so that the area gets proper warmth...
Health Tips
If in Gurgaon , feel free to visit our physiotherapy clinic at Sarvodya Hospital sector 4.. refer address from database or contact at mentioned mobile number