Ask your doctor for some numbing cream, commonly called "Emla" which you can put on a few places they normally find her veins.   Put it on an hour before she gets her blood drawn.   The nurses can poke all they want to until they find a "good vein" and get enough blood drawn for the test, and she’ll barely flinch.    We have two children with CAH, and the EMLA cream has been a godsend for us, and made lab visits bearable.