It’s not as simple as that. They tried to award it just to her husband before splitting it in half and awarding both. Marie Curie’s Wikipedia page says:

“At first the committee had intended to honour only Pierre Curie and Henri Becquerel, but a committee member and advocate for women scientists, Swedish mathematician Magnus Gösta Mittag-Leffler, alerted Pierre to the situation, and after his complaint, Marie's name was added to the nomination.[45] Marie Curie was the first woman to be awarded a Nobel Prize.[24”