Dear Sherri,
You're a donor, you're qualified! That said, I'd highlight your active, supportive role here, and that you've been a resource to others on the path. Experience on a not-for-profit board, or management, or fiscal acumen are all background qualities that could be helpful. Mostly, what they seek is that at any given time, the public representatives to the board reflect the diverse stakeholder communities affected by transplantation. I think your perspective and demeanor would be a valuable addition to the ongoing debates. Do consider it!