They can easily give her magic back, by just pointing out that since it was all of her future magic, in a timeline where she would of lost and died because of the battle, that it was only the time from then, till when she bled out and died that she absorbed the magic from, and everything returns to normal after that time is passed. It should reasonable be something like 5 minutes, but I could see them passing it off as a week of her bleeding out to keep her powerless longer.