Hurt her knee while bathing. Pain.

2 days ago, while bathing she hurt her knee. Her leg slipped and her right knee hit the wall then a bucket full of water feel on the same knee. She didn't do anything thinking it was minor pain. Couldn't go to hospital on Saturday or Sunday. The pain worsened over time. "She currently is having trouble bending her knee, its very hard to walk, redness in the knee area, alot of swelling, and in her words "it feels and sounds like rubbing two stone together" when she tries to move it. Till now she has applied diclofenac gel multiple times, ice once a day, a tied knee with a clothe. On Monday morning she has an important exam and right now she cannot even walk. Earliest she can go to a doctor is after her exam i.e. 12:45 Monday. What should she do to decrease pain.