Re: My daughter fancies her second cousin.
I think you should ignore this completely and shouldn’t make the mistake of talking about it, instead you should start trusting her, give her the surety that you trust her and will support her to make her feel secure.
I know most of us did similar things when growing up but if we remember it clearly the reason was that we either felt insecure or couldn’t find our parents trustworthy or friendly enough at that time. You and your husband need to show a lot of love and trust to her, so stop spying on her because young adults love their privacy more than us adults.
You don’t need to read her notebook to know her, just talk to her about your expectations from her and have some good family time together everyday, and also pray and tell her to pray for protection.
You can start talking about the teenage pregnancy rate in UK and also STDs and the religious aspect of it (zina etc) in a friendly sort of environment.
At the end of the day your children will be what you expect them to be.
I don;t make it a habit of reading her books or journals. The book in question where I read these words were in fact her school planner which has to be signed by the parents every week.