First of all, as those with at least a working knowledge of the Free Britney movement know, Britney Spears is still under a conservatorship, largely controlled by her father, Jamie Spears.
The superstar has been trying for several months to have her dad permanently removed from her conservatorship, which hasn’t been allowed yet.
My guess is that this could involve some combination of two possibilities, for the most part.
This means that he has to sign off on most of her life decisions, including those which involve her career.