Mentioning the female gender (I am assuming cis-gender sex/gender terminology) is an identifier that points to the added difficulty of starting a company in a culture where women are treated as inferior or have less social power. So they're pointing out how the company was created under potentially difficult circumstances. The idea that it's difficult for women to start companies turns gender into a kind of 'selling point', as in, because this company was started by a woman, it's clear the founder must have extra-ordinary abilities to be able to survive in a culture that often treats women as inferior, and this company may have properties that make it "better" than any other average company not started by a woman. So gender mentioned here is not only falsely attributing greater business acuity to the company, it also acts as a PR flag to attract attention to the company. People therefore perceive it as important that the founder is female, hence mentioning it in the title.