You have already answered your own question.
Yes she will.
You said that after she was with Serge for a time, the behaviors stopped or reduced. Then after going home, she started back up again. Cockatoos have a long memory. She will keep going back to the same behavior pattern again as long as you allow it.
How are you doing with the behavior modification protocol? Ignoring the inappropriate behavior is only the first part of the treatment necessary. Read on. You will find that to only ignore the inappropriate would not be fair. You must also teach her what behaviors are appropriate. And furthermore, teach her that you will elicit these appropriate behaviors and reward her for them on a regular, consistant, and scheduled basis. only then will she begin to realize that the inappropriate behaviors no longer work and that the appropriate ones do, and that these appropriate ones are under your control, not hers. Think of her as a small child who is throwing temper tantrums to have her own way. What would you think of a mom who gave that child her way whenever she had a tantrum? Not much, I bet. I'm sure it would at least be obvious to you that this child will never stop the tantrums as long as they result in her getting her own way, right?
The protocol I outlined is very specific and detailed. It is not a quick fix. This protocol will take time to show results and only your dedication and consistancy will allow success. I even suggested that you consider doing this protocol at Serge's house, where she has demonstrated a reduction in the inapproriate behaviors.
You must not try to ignore these behaviors. You must just do it!!! Even if that means you get up and leave the house when you see them!!!
If you don't, she is at risk of intensifying them to a point where she will inflict fatal wounds to herself. I have seen this too often to have any doubt about it.
The more you respond to them, the more completely she will have controlled you and the more intensly she will display them!
You have proven this by observing the reduction in behavior when she lives at Serge's.