According to the Wikipedia entry, she assumed the title between 1624 & 1626. Her brother was King at the time - and committed suicide. Nzingha assumed control as regent. His son was away at the time of his death, and is rumoured to have been killed by her on his return. See the related link for the full article.
NZINGHA
what does the nzingha mean
Nzingha had strongly opposed her brother's participation in the slave trade. However, it was not until the Portuguese traders began to make heavier demands on the King for slaves, thereby reducing his own profit from the trade, that he decided to resist and declare war. The war between the Portuguese, and the Ndongo people lasted for several years until the Portuguese decided that a peace conference would be held for both sides to negotiate an end to the war. It was at this conference that Nzingha would display her immense pride, determination, and iron will, traits that the Portuguese would be forced to reckon with for the next thirty years.
she was dead and when people are dead they become queen
Once the Queen (Elizabeth II) dies, Prince Charles will become King, after he dies, Prince William will become King, and Kate, as his wife will become the Queen Consort (not the Queen Regent, like Elizabeth is)
by being the queen!
Succession
They say that because when the Queen of England dies Kate will become the queen. =)
Queen Isabella became queen in the year of 1474
it has been 60 years since the queen has become queen.
she became queen in 1896
cause she is the Queen of Egypt