This coming info is provided by Diana Petersen--Thanks Diana
TWOSRET (Tausert) (19th Dynasty c.1187-1185 BC)
As with Nitocris and Sobeknofru above, Twosret's reign was during troubled times and lasted less than three years. She was the last Pharaoh of the 19th dynasty. Tausert was the very beloved wife of Seti II even though she was not his first wife and it is believed that it was Seti II who ordered her tomb to be built in the Valley of the Kings; an honour given to very few queens. Again the evidence is sketchy, however the general consensus is that, upon the death of her husband Queen Twosret became co-regent with the king's young son, (Ramesses-Siptah), by another of his wives, and then after his death (approximately six years later) ascended to the throne herself, proclaiming herself Pharaoh."
"Following the death of her husband Seti II in 1194 BC, Twosret eventually took the throne for herself, declaring herself queen and using the full pharaonic titles as Hatshepsut had done some 300 years earlier. During her short two year reign, she sent out expeditions to Sinai and Palestine and built a beautifully decorated tomb in the Valley of the Kings that was later usurped by Setnakhte, first king of the 20th dynasty. In addition to her tomb, work was begun on a mortuary temple south of the Ramesseum, the foundations of which were discovered by Flinders Petrie. Objects with her name have been found at Deir el-Alla in Palestine and Serabit el-Khadem in the Sinai, and a statue of her has been found in Heliopolis. Her name also appears at Abydos, Hermopolis and Memphis. A horde of gold and silver vessels bearing her name has been found at the site of Bubastis. With her death came the end of the line of legitimate successors to Rameses II and thus the 19th Dynasty. "
As per Kabalarians :”Your first name of Twosret has given you a quick-minded, sensitive nature. It gives you a clever, creative ability in art, music, singing, or drama and an appreciation for refined surroundings. Your sociable nature expresses affection, kindness, and thoughtfulness to the extent that it is difficult for you not to be affected by others and governed by your emotions, rather than by logic and reason. As you respond to love and encouragement from others, your romantic and dreamy nature can easily lead you into love affairs. “
So did she steal power? Well, even if she did, it is a normal behaviour. Everyone does it especially in our modern times. I guess, power is so tempting. However, had she known she would be executed, I think she would never have thought about stealing this doomed throne of ancient Egypt.