Why are there only very few essays about woman empowerment, a topic I found tremendously moving and touching?
In terms of writings that show the empowerment of women, I believe that perhaps you need only to learn of some female writers who have concentrated on empowerment of women to find what you feel is missing in literature. I have found that Toni Cade Bambara speaks to this theme, as does Kate Chopin. Maya Angelou is another. These women speak of empowerment, generally in the face of overwhelming challenges or dire circumstances.
Amy Tan offers this sense of empowerment for women as well. And while she states that because she writes about Chinese and Chinese American women some reviewers want to study her literature as a social statement regarding the Chinese culture, Tan insists that this is not at all her intention: she is a storyteller first, and people often associate with her stories not because of the cultural component of her Chinese characters, but because of the commonality that many of her women share, regardless of their cultural heritage.
"What my books are about is relationships and family. I've had women come up to me and say they've felt the same way about their mothers, and they weren't immigrants." She sees the writer as "storyteller, teacher, and enchanter."
I think that there might have to be a bit more definition in the idea of "few." One of the most powerful elements of Tan's work is that it helped spark the scholarship regarding the valences of gender and ethnicity and how the two correspond to one another. One of the results of her work is that much in way of writing began to be generated on the female condition in Asian literature and the very idea of what it means to be a "woman" in the face of an ethnic condition that also requires analysis. Tan's work was able to spark or prompt the idea that the circles in which race, class, gender, and identity reside do not exist in separate spheres. They are not concentric as much as they are convergent upon one another, in which analysis and thought are required. There are a couple of essays which deal with these ideas featured on enotes, itself. I think that you can find more online. Naturally, there can always be more. However, I think that one of the lasting legacies of Tan's work is the idea that discussion of these angles of perception, valences of consciousness were discussed and written about quite extensively.