Hannah must be close to securing the No. 1 ranking...
Yes, though Julieta (the current #1) didn't score any points at the US Open juniors last year so she's not losing any (although she's not getting any net new ones, as she has 300s as her current lowest scorers anyway)
Haven't done the calculations though, for if Hannah were to win, say
Hannah is currently set to be World No. 2 I think never mind who wins singles or doubles just behind Pareja. If she beats Vandromme in the SF she will be World No. 1.