About approval of grant of potential mentor
Definitely follow her and her team on the various digital networks that they may be on. Most teams have Twitter and university groups.

Figure out when the grant rounds are decided and published. Most national grants will have public websites etc. Private grant institutions may also have ways to follow them. 

But what is more important for you is to know when your usual post doc dates and times are. Her grant may be after that time which may limit your choices. Keeping all the factors in mind is an important strategy.