If you're really worry about twisting fall,not a lot of bindings will release under circumstances.
MOB really advertise the fact that it can release in all directions but never tried them and no one that i know use them.Bit expensive too...
Reflex is always a good choice IMO even if i had an Achilles rupture using it but it was one of those weird fall,no twisting involve.Bad side she will outgrow the shell in X time.
Good shopping!