thanks for your comment.her doctor didn't test ESR again unfortunately,new test contains : WBC,RBC,Hemoglobin,Hematoctrit,MCV,MCH,MCHC,Platelets,CRP,RF,AntiCCP. also she uses prednisolone for a long period.
You mentioned her ESR from a month ago, but not her current ESR. ESR and CRP are similar but it would help to know her current ESR. If low to normal, then I'd say the prednisolone is doing well ;)