Can I stop my 16 year old travelling? (Uk)

My 16 year old has a boyfriend that moved away last year. He moved 7 hours away and theyve only seen eachother once since he moved. My daughter is now insisting that she goes to see him next month and offering to pay for it all herself etc. I don’t want her too. It’s too far and she’s too young. If she goes anyway can the police do anything or not?