One can find lesbian fiction on various websites like GoodRead and AutoStraddle. One could also go to a local comic book store and ask if they have lesbian fiction for sale.
Yes, she is. In a number of interviews the interviewer makes references to her girlfriend*, and she has previously stated that she has no problem being out because she does not want to be perceived as a liar. *http://www.autostraddle.com/kate-cooper-from-an-horse-the-autostraddle-interview-25132/
Yes, there are several magazines that cater to a lesbian audience, such as Curve and Autostraddle, which focus on topics relevant to lesbian women. These magazines cover a wide range of issues, including relationships, fashion, culture, and sexuality from a lesbian perspective.