Do you know what meds she is on - all of them?
I'd check all the meds for interactions or not being taken properly..
Was she prone to panic attacks before the PD dx?

I'm guessing the husband is not your father, but can you talk with him about how he thinks mom is doing?
Or talk with the care nurses, Dr with your concerns.

She could have another condition as well as PD that's complicating things - emotional or otherwise.

Does she call you, or can you see her in person to be able to see how she is doing?

I don't know the law, if she is married I think he would be the one to do the nursing home thing , unless mom signs power of attorney & care to you... but maybe the others know more about the legal side of that.
And they might have other ideas about the situation.