She was way behind in the polls before the Argentinian invasion and was quoted as being the least popular prime minister in history. I agree with your view on Foot and Labour at the time but She was leading them in to an election defeat despite Foot.Yes she did. But I’ve always been unconvinced Foot’s Labour would have won in 1983 regardless of the Falkland Islands and how unpopular Thatcher was. They were a shambles.
My view is that we would not be talking about Thatcherism as an ideology because Labour would have inherited the mess in 1983 and another leader from the Conservatives may well have won the election in 1987.