American Heritage Dictionary reads:

incognita: adv & adj, with one's identity disguised or concealed. Used of a woman; n, A woman or girl whose identity is disguised or concealed.

So, is it correct to say 'Giselle Regan, an American reporter, went in incognita and used hidden cameras'?

American Heritage Dictionary reads:

incognita

• adv & adj, with one’s identity disguised or concealed. Used of a woman;

• n, A woman or girl whose identity is disguised or concealed.

So, is it correct to say “Giselle Regan, an American reporter, went in incognita and used hidden cameras”?