I'm so sorry to hear of your daughter's illness and hope she's better soon!
My father and his sister both had Rheumatic Fever in their teens. They both were diagnosed with heart valve impairment in their 50's that their MDs thought might be related to the RF. Dad had mitral valve replacement at 60. His sister died of some sort of circulatory problems in her 60's, not sure of exactly what as they had lost contact over the years. We do know that she suffered from severe varicose veins. Related to the RA??
Had they known of the possible connection, could the valve problems have been prevented? I certainly don't want to scare you, but please ask your daughter's doctor, perhaps confer with a cardiologist?