Need info please.

I am concerned about my daughter. She had blood tests done and they came back showing she is slightly anemic she is 15 and they are at 11.1, it also showed she has inflammation her levels for that were 29 and are supposed to be below 20. So they had her go back for a Ferritin level test, which has came back normal. So they said she doesn't have Iron Def anemia. About 1 1/2 years ago she was diagnosed anemic and she was on an iron supplement for about 9 months (doubling the dose half way thru) and only managed to get it up to 12.1. She is having bowel problems( Irritable Bowel symptoms).So they had stool samples checked, we are still waiting on the Fecal blood cultures but the other tests are normal. She has horrible leg and joint pains a lot too but she has seen a rheumatiologist before and they said its not arthritis. Has anyone any ideas as to what this could be? Would just appreciate some info.
Thanks Saltire