I mean I think it's JuJu Watkins, and not even that close (though Hidalgo might have something to say about that).
JuJu has basically made USC a Final Four contender overnight.
Hidalgo is fantastic, but she has more known quantities surrounding her (though many have been injured), and ND doesn't have a defining win on the season like USC does (in Ohio St and UCLA).
Madison Booker, especially since Rori's injury, has been an MVP for that team, but her stats just don't compare with JuJu.
Taliah Scott is having a fantastic season at Arkansas, and is probably the favorite (?) for SEC Freshman of the year just due to the load she carries--but I know she's missed several games recently which might hurt her (in addition to Arkansas being a mediocre team).
Mikayla Williams, Fulwiley, KK, Shade, and I'm sure I'm missing others, are all great--but they are not being asked to carry their teams like the above players [even if they are playing VERY valuable roles].