...she's very much at ease with who she is. Being named Prom King looks like more of an opportunity to show that kids like her (she came out as a lesbian; she's not FtM) and other LGBT kids can be accepted. From the article:

By winning prom king, Walker hopes other gay, lesbian, bisexual or transgender students will have the courage to come out and be who they are. She also hopes other students and teachers will be more open-minded about how society is changing.

“People shouldn’t think about stuff that was written a long time ago or based on beliefs.” Walker said. “People can have their own beliefs, but they should accept others for who they are.”

Here's a pic from another article: Mariah Nolan, Prom Queen and Diamond Walker, Prom King