At the beginning of the space chase in The Last Jedi, we learn that the Resistance can't jump into hyperspace because they will use up all of their fuel and be sitting ducks. However, after many hours of flying through space and using up fuel, Admiral Holdo seemed to still have enough to jump into hyperspace and crash into the Supremacy.
So my question is, if they barely had enough fuel to jump to hyperspace at the beginning of the chase, how did they have enough to do it at the end?