I tend to agree with eezybee, she was the author of her own downfall.
I was in London today and picked up a copy of the vening Standard to read on the train home. Now the editor of the Standard is George Osborne, so he has a particular, but informed view. But the paper gave a fair assessment of her faults and successes.
The paper said that her first mistake was to fail to fully take on board how close the referendum result was, instead by describing it as 'decisive' and pushing through Brexit plans regardless of other opinions, she was, at least partially, responsible for the mess Brexit has become.
Then there was the decision to call another election in 2017. A decision made by a small tight group of advisors with little wider party consultation. This applied to a lot of her decsion making, with, at times, cabinet ministers not told in advance of major decision announcements.
Overall I think she was cloth eared and socially gauche. Dealing well with terrorism, but not acting fast enough at a personal level, to the Grenfell Towers fire, and then only because she was advised to, nor did she understanding the need to be seen to be listening and responding to her parliamentary colleagues
I am not sure whether she would have been any better if her term in office had not included Brexit. I feel her personal traits, not being a people person, vital in politics, where networking and a certain amount of buttering -up is essential and not being sensitive to public expectations after desperate and tragic events, would have lad to her downfall.
Gordon Brown was another such and his lack of the personal touch, made his premiership similarly fraught, despite having a wife in PR, who had a very sure feel about these things.
Both of them worthy and principled people, but lacking the populist touch so essential if you are prime minister.