Just watch for knee joint movement if there is no restricted movement no need to worry,
For pain - you can give Pain killer orally, you can apply pain relief gel on injury
site(if there is no open
and movable lump - It take long time to go.
I would advice:
1.Warm compression on knee(Blood circulation)
2.Watch for knee swelling
3.Watch for restricted movement of affected knee.
4.For safe side X-Ray knee AP/LA,
You should get her evaluated once for her complaint to get her examined physically by a pediatrician
"I wish she will get well soon"
Regards Dr. Sagar Mhatre