It's true to say, as in the link above, that C19 monarchs had no power to amend legislation, in the form of bills presented to them for assent, nor could they exercise their power of veto; this still exists but has not been exercised since Queen Anne refused to agree to a bill for levying militias in Scotland, on the grounds that Scots could not be trusted to control their own !
However, it is and was always possible for the monarch to give her views at an earlier stage, in the hope that someone would agree and apply them to proposed bills.Queen Victoria took great exception to the proposed verdict in insanity cases that the accused was "Not Guilty, but insane". She was not disposed to the view that any madman who tried to kill her; and there were several in the course of her reign; were not guilty of anything! Accordingly, the verdict was made "Guilty, but insane", which it remained for many years after her death.