Karol,
I can only imagine the stress and anxiety related to finding a donor for Jenna. As a parent I'm sure you wish you could save Jenna but that isn't always possible. You know the intricacies of this system, and some people do decide after speaking with the transplant center, their own physicians and family that they do not want to continue. So maybe this person decided to opt out or if they have not contacted the transplant center yet because they are still thinking about the ramifications. Most centers encourage people to test first and think later, which IMHO is a little backward. The hospital and recipient want to identify possible donors and then present the donor with the medical out in order to satisfy the no coercion clause. However, in the interest of protecting the donor, one should really decide if they want to do this before finding out they are a match. It may also be in the best interest of the recipient and not to get one's hopes up too high to have found a donor but then find out they opted out. May be harder to swallow when you know there is a match but not accessible to you.
Good wishes as Jenna and your family face the next stage in her disease. I wish her the best health possible while waiting for another transplant. Hopefully "the one" is out there and you will find them soon.
Sherri