I’m not sure why this is even a question. Go pro.
Most of the money will come via endorsements and she should strike while the iron is hot. Use the millions she’ll earn and pay for college after fact that or never get a degree and use the money to enable her to spend the rest of her life coaching.
By staying amateur, not only will she risk losing her reputational momentum, but she’ll also risk injury that could take her out of the sport altogether and eliminate any chance of subsequent endorsement deals.