Yes, several times. I ran a bird rescue for 6 years while I lived in Pennsylvania and, although I did not adopt out a lot of them, the ones I did rehome all ended up in good homes. The reason why I did not find homes for many of them is that, in all honesty, it's so very hard to find a home where a parrot would actually thrive. Parrots are just too difficult to keep healthy and happy... They need a fresh food diet [organic preferably], company all the time, hours and hours of out-of-cage time and flight time and, depending on the species, almost as many of one-on-one. They also need to be kept at a strict solar schedule -which is impossible for anybody who works outside the house for more than 4 hours. Then you have to take into consideration if the person has enough financial resources [avian vets are not cheap], if they live in an apartment or a home [loud species can't be kept in an apartment], if they have a 'stable' lifestyle, and this is much more complicated than it sounds because, usually, young people are always 'changing': they get a significant other, a spouse, children, new job, etc., and many older people who are in a good financial situation want to travel... I recently rehomed a sun conure to a neighbor and she is not only doing great, it did not take me any time at all because it was one of those opportunities that kind of fall on your lap. But, before that, I rehomed a Timneh gray and it took me months and months and months of looking and screening A LOT of people [I don't charge a penny for them and I even offer to supply them with gloop for as long as they need it so, of course, there are lots and lots of people who reply to my ads but the greatest majority of them have truly no business having one].
I wish I could help you and take her myself because I actually want to get my male cockatoo a female [I always try to get all my birds a companion of their own species or a similar one because it enriches their life as nothing else can] and, at her age, she needs somebody with a bit of knowledge of the right diet and supplements but I recently took in two new birds [a black capped caique I flew to Miami to pick up and a quaker I drove to Maryland for] and, although they are adjusting marvelously [THANKFULLY!!!!], I am spreading myself a bit thin trying to spend time with both of them as well as the 'older' birds that are still very attached to me and get jealous of the new birds -actually, there is only one bird that does that, Zoey, my female Senegal, who is super independent by now but, every time there is a new bird, decides to perch on me all the time so as to prevent my bonding with the new birds. I am used to it because I've had her for several years and know 'her tricks' very well but I have to be on constant alert all the time and it takes a balancing act on my part. To give you an idea, right now, as I am typing this, I have Zoey on my right shoulder, the new quaker is on my left shoulder, Isis Redbelly is on my left knee and Javi -the new caique- is on the kitchen island [where I have my laptop] playing with a ball made out of scrunched up paper that I have to roll at him every few seconds or otherwise keep entertained - see what I mean?
I would say that you need to look for somebody who lives in a house and has a bit of experience on cockatoos [everybody wants them but few people realize how difficult, loud and destructive they can be] and who is there during the day, has a stable relationship [lonely people all want parrots but it's more to 'fill the empty hole' than because of love of birds and as soon as they get somebody, they forget all about the parrot] no young children or the prospect of having any and who doesn't travel much at all even though he/she has the money for it. Not easy... I prefer older people to young ones because they are more 'settled' in their ways and that's always a plus for parrots.
If you are on the West Coast, we have a member who has a small rescue in her home [the ideal situation for parrots that need to go to a rescue because it's more like a foster home than a rescue] and specializes in cockatoos who might have 'room'. She hasn't been on the forum for a while but if you contact me via pm and let me know where you are located, I might be able to help you.