I am sure Yoshi is going to be just fine in her new home, she may be in her honeymoon phase right now but she seems like she is going to do just fine under Robin's care, after all she has had plenty of experience with two greys of her own. I am sure she will face some tougher times in the near future as Yoshi unpacks her bags but that is to be expected. You have done a wonderful job with her and it shows in how she has related with Robin's family, she will pick her favorites but I think she will be friendly with all of Robin's family, time will tell.
I know you didn't want to give her up but sometimes we are forced to do what we don't like to keep harmony in the family, I do like your idea of volunteering at some place that has birds as you have a lot to give and it will do your heart good even if you can't have any in your home, when life hands you a lemon make lemonade.
I look forward to hearing how Yoshi is doing and maybe Robin will share some pictures soon.