
She needs stiffer boots than the Debut considering her technical level. The strength of the boot needed also depends on her size, but I can't tell from just her weight. It depends then on how tall she is. She weighs more than I do, for instance, but may be several inches taller than I am.
I'm assuming from your username that you're in Canada, but where specifically? We can try to direct you to the best skate shop near you so she can be fitted properly. The fitter will measure her feet and ankles all around. Their circumference at various points is important, not just their length. Different models of different boot brands are designed for different foot shapes, although some alteration can be done with heat moulding. Jackson may or may not be the best brand for her feet.
You should involve her podiatrist in adding arch supports or padding for her bunion area, working together with the boot fitter to ensure her boots won't add to her foot problems as she grows. Good luck!