She was told that even if she is willing to have sex with her girlfriend, it is still against the law for her girlfriend to have sex with her.
Her girlfriend (not Maddy) could face a serious criminal charge, jail and be placed on the sex offender register.
:-)The two issues are sex and custody until you are of legal age.
The police aren't going to launch an investigation over what goes on in someone's bedroom but the person that has custody has options like declaring the minor to be a runaway or charging the adult with contributing to their delinquency, depending on the laws there.
There are services that can help you with how you’re feeling, safe sex, relationships, sexual abuse and the law.