I have been trying to reply but posts have been earen by machine. I think your wife is obviously very caring and is just getting to this point has often been a struggle. I am in similar position as having a working diagnosis that is yet to be confirmed. You still feel insecure and a little in no man's land. There is a lot of supportive positive people on the forum, that enjoy life and their optimism is infectious, so you and your wife can ask questions and read past posts that can help.
I don't know if you have a PK group in your area, they can be very supportive and have a lot of experience to share. There is also the helpline on this site.
Everyone seems to have a different experience with pd, so you can end up worrying about issues that might not happen for you, so although you need to be informed try not to panic. Your wife can be assessed for carers needs. In our area our local adult social services have a web page where you can self refer, if that is something she needs, or something to keep in mind for the future.
At least you are in the right hands and getting help. Hope both you and your wife get the help and reassurance you need. As you say I think you will feel more supported when the diagnosis is confirmed.