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Hi, this is Dr. Jeanne Smith. I just came on line and saw your request. I'll be typing for a few minutes.
One possibility for Penny's breathing is stress or pain. Another possibility is if she aspirated some of the fluids you've been giving her and it has caused an inflammation in her airways, but if that were the case I think you'd be seeing more constant open beak breathing by now. If she only does it while in your lap for treatment, she may be stressed or even getting a little warm.
Birds dump extra heat by increasing blood flow to their legs, lifting their wings, and panting. In your lap she's sitting on her legs and she probably can't spread out her wings much so the only way to dump heat is by panting.
Yes, you are. If she has Marek's Disease it progresses to affecting more nerve tissue day by day. There isn't anything you can do to stop it. All you can do is try to make her comfortable and support her life in the off chance it isn't Marek's.