I am not a parent. So, please take what I have to say with a grain of salt.
Kids will date if they want to date. It's not impossible to hide a relationship especially if they aren't living under your roof. The only thing strict rules around dating do is create a sneaky relationship. I think it would be better to allow her to make her own decisions, but her give her the space to tell you about them. You can guide and help her, but at the end of the day, she's far old enough to make her own decisions.
At 14 years old, I started dating a guy that I would end up being with for the next four years. My mom was the first I told. We were allowed to go on dates. We weren't supposed to close the door or sleep in the same bed. The rules were so relaxed that I never really pushed the boundaries. We never had sex, and my parents were the first I went to when I decided I needed to break up with him. The relationship was going south. Everyone could see it, but again, there was no force. I was allowed to make those decisions.
Then, I met another guy at 19, and I got married at 20. My life is stable and sweet. I am thankful for parents that supported me. I learned hard lessons, but I had parents that comforted and helped guide me through them. At 24, I am as close as ever with them.