My daughter has sickle cell trait and lately she has been complaining of pain in her knees and sometimes she can't walk we've been to several speciali?

See below.: There are a lot of possibilities, some relating to sickle trait, some not. If a pediatric hematologist feels the knee pain is not due to sickle trait, and a pediatric orthopedist can't find a physical cause, the pain might be due to overuse or muscle spasm. In that case, daily stretches might help. If she has not seen the above specialists, she should. I hope her symptoms resolve soon!

Sickle pain: Bone and joint pains are common in sickle cell. Stay hydrated, warm, and out of oxygen debt to avoid attacks.