It depends on the precise binding but more often than not the toe is fixed and the heel is adjustable or everything is mounted on a rail.
What binding is it? I’m surprised it isn’t some sort of adjustable binding as most kids skis come with that unless your daughter has very small feet (which it doesn’t sound like). I only seen the very smallest kids bindings need drilling without the potential for adjustment.
I’m still a bit confused though about why you’re doing it this way round. Hiring boots in resorts is painful both in fitting and using. Hiring skis is much simpler and easier.