In fairness her description of the other "vegetables" was spot on, something many leaders have suffered from being surrounded by.
You could be the best football team manager in the World, but inherit a shit clueless team with no money to spend on hiring better players, and the ones you have to hand with little real talent, and you probably are not going to lead them to the premiership trophy, FA cup, or even the European cup come to that.
The best leaders in the World can often inspire given the chance, but if the line up of folks to pick and choose for the right jobs under them is lacking in clibre, you will never manage to pull off much with the hand of cards you are dealt.
Being PM today is just a moment in time glory title, something to add on your "next line of employment" CV, it's just a constant battle once you acquire the position to try and lead many folks, even in your own party, that do not want to be led, as they either think they know better than you, or secretly just want your job!

But they did not destroy entire communities. In my time with the NCB mostly pre Thatcher many small pits were indeed closed but their workforce was largely transferred to the larger pits who needed the miners. Thatcher just made them redundant with no alternative employment and imported Australian coal.