Is your daughter tapering down on the Prednisone? Prednisone is usually given for 2 weeks post-ATG (to fight serum sickness) and then tapered within a month or so. You definitely don't want her to be on this drug longer than necessary.
It is my understanding that a transplant is regarded as the first course of treatment for SAA for people that are under 20 with a matched sibling donor, as the probability of survival is around 85%. Younger people also have less risk of GVHD.
http://www.marrow.org/PATIENT/Undrst...mes/index.html
If possible, I would consult with multiple centers as to their best pretransplant regimen, if you decide to go that route.
Where is your daughter being treated? I also am in Northern California.