I got along so horribly with my soon-to-be 21 year old, that she left me to go live with her dad. It was tough, but in hindsight it was probably the best thing that could have happened!
We're extremely close now. She's honestly one of my best friends!
DD16, not so much, but we'll get there too. I have no doubt, and neither should you.
Girls are tough animals to raise!