Final answer:
A post-transplant intervention for a 7-year-old girl undergoing a stem cell transplant is monitoring for severe diarrhea and maculopapular rash.
Step-by-step explanation:
A post-transplant intervention for a 7-year-old girl undergoing a stem cell transplant is monitoring for severe diarrhea and maculopapular rash. This is important because these symptoms can indicate graft-versus-host disease (GVHD). GVHD occurs when the donor cells attack the recipient tissues, and it can cause a rash and damage to the liver and mucosa. By monitoring for these symptoms, the nurse can take appropriate action to manage GVHD.