It's a truly great shame that she died the way she did. No one (regardless of their role in politics) deserves to die in such a way as stroke.
The only pleasant thing (if you can even say that) about her death is that she sadly had dementia, and it would also have been incredibly upsetting if she had died in the painful and frightening way that dementia can cause.
There were a number of poor choices that Thatcher made during her role as Prime Minister, but she was ultimately a great person and was an inspiring woman.
She should be remembered for being the first (and so far only) female Prime Minister of Britain, and being selected by the Conservative party (Who are generally considered much less open to change or access for minorities or those not fitting a Christian White Male status) as their leader and her party subsequently voted in to power.
That alone gives her all right to be considered an important figure of British politics.
And then the things she managed in her time of power.
She guided us during the Falklands War, and she worked monumentously to deliver Britain from it's post-war state.
Many Labour supporters would attack her for her dealings with the Trade Unions, but she fought against them when they would cripple the country for ceaseless strike action. It was her work that prevented another Winter of Discontent.
Regardless of your views on her policies, I think everyone should atleast have respect for the fact that an important and strong-willed woman has sadly passed on.