Women are technically exempt from the mitzvah of Keri’as Shema (it is a time-bound mitzvah). But since the concept of “accepting the yoke of Heaven” is so fundamental, it is proper for a woman to recite “Shema”.
It is better if she does that within zeman kerias Shema.
Good: “Shema” and “Baruch shem…l’olom va’ed”
Better: “Shema” and the entire first paragraph
Best: All three paragraphs of “Keri’as Shem