I think Elizabeth sold Gabriel. She sold her eggs as a teenager (the going rate is as much as 5-10k). Why kill a valuable commodity? She is holding out on key facts because hurting Logan feels so good and because she doesn't really believe she's going to be in jail that long. And of course, she would be stripped of her victim persona, which might be the worst thing of all.
Who helped her? Who are the buyers?
Who helped her? Who are the buyers?