Free tutorial on how to make a Hospital Stethoscope for American Girl Doll -How about a painted suction cup (from: sun catcher hanger, bathroom accessories or such). The wire could be poked in and glued.
Restringing AG Doll - I have done this many times, it is pretty easy and saves you a trip to the doll hospital. Just don't do this with your daughter in the house, seeing her doll without her head is a little daunting.
Hospital Gown and wrist band for American Girl doll