There is a reason kids are supposed to be a certain height to ride, and most of the rides that require a certain height are seated rides - adding those shoes is not going to make her taller in the seat for a ride, it might get her into the ride as the CM might not notice her shoes but I would not take my kid on a ride unless they were tall enough for that ride in bare feet - because some kids are long waisted and some are short - so it is just the laws of average I guess where they determine the heights as they are measured standing, not seated.
I am in insurance so perhaps I am a bit more careful than some, but I'd never want to take a chance on something I guess...if she is tall enough though and you are just wanting to make sure that she gets on, as so many people measure their kids and then get to the line and the stick measures them differently, well that is entirely different - but I just don't think it's a good idea to try to make a kid taller just to get on a ride.
I am sure this happens all the time though, we have friends who used to put kleenex in the heels of their daughters sneakers of all things! She was always fine too.
They are cute shoes though.