Yes. If she entered legally and you're both in the US, there should not - absent other issues not provided in your post - be any issue to adjust status for her within a few months. It is always best to hire an immigration attorney to represent you in any and all immigration matters.
This advice does not form an attorney-client relationship and is merely informative. It should not by itself be relied upon to address a legal concern.
If she entered the USA on a qualified visa or is outside of the USA and not inadmissible, yes.
The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter,not should it be viewed as establishing an attorney client relationship of any kind.
Yes, your spouse is now considered an immediate relative and outside the family preference categories.
The only waiting period is for processing of the petition and appropriate applications by the USCIS, or the USCIS and NVC/Consulate.
Yes- an immediate relative of a US citizen a visa is readily available to her. Absent any other bars of inadmissibility and the like shouldn't be a problem. Retain counsel so that no errors are made on the AOS application. Good luck.
This answer does not create an attorney-client relationship and is not meant to be relied upon as legal advice.