You can ask her to stop and if she doesn’t then you can try to threaten her by saying that you can record all those activities which she does again you will show the recording to the boss and try to solve the mess. When your boss believes on you at that time you can also tell the rest of her desire that she wants you to be with her in the night. Tell them that you are facing this problem from long time and you were not able to approach anyone the office because you were afraid of loosing your job without any fault. You thought to show with an evidence and due to this you recorded a video and not to use it in wrong way. You were being pressurised and due to this you are becoming ill mentally.