Bailey, I am so sorry to hear she has started plucking again, but maybe you will have to separate them so she will not pluck out Sam's feathers too. It could be a reaction to being left for an extended amount of time, this is going to be difficult to resolve especially if it is being left alone that is causing her to pluck.
Don't despair, Bailey, you are doing what you can to stop it but it is not your fault, maybe some of the other members will have some suggestions that may help to put an end to this plucking. In the meantime ignore it and keep your chin up.:ohmy: