Lied about being raped my cousin lied she got raped she had a threesome and three months later went to police?

She said she got raped but I have a feeling she is lying. She said my friend raped her but he had sex with her like two days after she saying she got raped won't a court take that into consideration. His lawyer said he should not tell the police he is 16 and she is 15. He is currently on bail for Rape. She also messaged him two days after the alleged rape on facebook saying "hey" and initiating conversation.