I understand she takes actions when she is “advised” to do things under her authority that were actually decided by others to whom the Crown’s authority has long been delegated at this point, but she is still more than just a figurehead and make decisions like this.
I’m pretty sure she probably has a very good mind of her own, and exerts it when she sees necessary - regardless of ‘advisors’.
And I’m sure she’s very deft at doing that :-)