Don't forget that visible 'evidence' can speak volumes where words mean nothing.  By this I mean, if you are consolidating onto one drive into one or more folders, then why not use screenshots of where the folders were and where they are now, as you do it.  That way she can see with minimum fuss what is being moved.  Do this per project (if that is what they are) together with how far each project has got and any deadlines that are coming up in the next year, or however far in the future.  This, together with a directory of new locations which lists old locations (sort of a quick glance at guide to have at her desk!) might be something she can handle, in both senses of the word.

It sounds like she does not want to feel out of control in an unfamiliar environment and so is looking for a way to learn what is practicable and what is not as well as how it is done.

Just my thoughts, based on what I have read so far.

Hope my ideas give you something to go on.

Jess