It clearly says she had gone to China for a kidney transplant: https://www.sfgate.com/news/article/Rose-Pak-SF-political-po...
“Pak was an overseas executive director of the China Overseas Exchange Association (COEA), an organization overseen by the Overseas Chinese Affairs Office (OCAO) of the State Council of the People's Republic of China.”
“At various times she spoke out in favor of the Chinese government's views, e.g. in 2012 calling all "overseas Chinese" to "defend the homeland” in the conflict about the Diaoyu Islands, and in 2008 opposing a resolution of the SF Board of Supervisors that criticized China for the Tiananmen Square massacre and other repression measures, passed on occasion of the Beijing Summer Olympics torch relay reaching San Francisco.”
“As revealed in a 2018 Politico report after Pak's death, among U.S. intelligence officials "there were widespread concerns that Pak had been co-opted by Chinese intelligence". These also extended to her work in organizing many "junket" trips to China for leading Bay Area politicians.”
Regardless of that, or the source of her kidneys, Pak is a textbook case of political cronyism, and how one person who never held elected office can use financial connections, backroom dealmaking, and sheer force of will to shape elections and policy for decades and steer the direction of a major city.
And China has an extremely well documented practice of doing exactly what OP said: https://en.wikipedia.org/wiki/Organ_harvesting_from_Falun_Go...
Not authoritative, but I thought this was interesting: https://www.youtube.com/watch?v=1JaPzJKycxc
https://web.archive.org/web/20200526081806/https://www.lamag...
Honestly, who cares? IMHO, Fulan Gong is only notable as an example of the kind of insane persecution the Chinese government can conduct against a group. They probably weren't the most sensible to begin with (which is no excuse for their persecution), and the level of persecution they've received it probably enough to make anyone an nut (e.g. going all in for Trump). Focusing too much on that mainly has the effect of distracting from the persecution.
And I do believe they're persecuted. Besides all the documented stuff, the (Chinese) mother of one of my friends can't travel outside her hometown because she was (mistakenly) put on some list of Fulan Gong people.
So then nobody asks questions.
This is in itself nothing sinister and cause for questioning. I don't know about the regulations in mainland China that govern organ donations, so I am not equipped to argue in this specific case.
Just the fact that one received a transplant doesn't mean that there is suspicious activity involved.
The CCP will move you to the top of this list if you're powerful and well-connected, as she was.
1. isn't verified ("rumor"), and
2. mentions many points entirely incidental to the operation itself and doesn't materially contribute to the topic of organ harvesting from inmates.