The crime she is charged with is sexual battery on a minor.
This often happens when a boy turns 18 and he has been in a consensual relationship with a girl who is still under age. When the parents of the girl don't like the boy, they can ask the police to charge him with a sex crime, and they often do.
Is this an instance of "homophobia" that the parents of the younger girl asked the police to charge the older girl with a sex crime? Perhaps. Possibly. Probably.
But the defense in this instance should not be to "save Kate because we suspect a case of ill feelings towards gays," but that the law in such teenage consensual relationship cases, is too overbearing. Kate is being treated perfectly equal under the law, it appears.