Well, I don't know about the research that is being done with this, but my daughter has had a heart transplant and has had some weird things that have happened to her. She started liking foods she had previously hated. After her transplant she would complain about her heart beating too fast sometimes and at one point she told me she had a dream where a young man appeared to her and he told her that his heart had sometimes beat too fast. She believes he was her donor. I have heard of transplant patients who were dealing with these issues. Do you know when your daughter will be put on the list for transplant?
You may also want to post your question in the doctor forum, where heart transplant specialists from the #1 children's hospital in the U.S. are answering questions for free.
Here's a link: http://www.medhelp.org/forums/Pediatric-Transplant/show/943