What kind of prep work? Just curious as to what you are thinking.
Fundraising. War rooms. Networks. Meetings
In every national campaign, there are at least six months of pre-campaign work behind it. Aside from printing campaign materials, there are donor meetings, flyovers, getting your positions out to the media, etc.
There is a lot of work that goes into a campaign before that campaign even begins. The fact that, to nobody’s knowledge, there is no indication that she has done any of that would indicate she probably isn’t running.
That does she won’t be involved. She is valuable as a voice and an endorsement.