Sure, it’s definitely possible for it to restore the physical shape of the horn, but there was zero guarantee that it’d be able to restore it’s functionality on top of that. At best, it’d be like some kinda high-end magic prosthetic, and at worst, it would be absolutely fucking worthless and purely decorative. And you knew damn well that she wasn’t going to want anything less than full functionality. And honestly, neither do you. You still want her as backup during the upcoming fight, and having her at peak magical performance would be a massive boon.