The blood on the other bed clothes are an indication that she nevertheless was able to get up and manage a few paces before falling backwards near the door.
I stated straight out she got up but was shot in the head before she did so. The issue is did she:
1) get up on her side of the bed and collapse by the door
2) get up on Nevill's side of the bed and then walk around the bed to the door or
3) get up on her side of the bed, run to Nevill's side and then run back to her side
The last scenario is what some suggest happened but it is hard to believe because it means she survived the head wound longer than one would think she would and worse how would she be able to freely run around the bed when the killer was near the foot of the bed? Even if the killer were at one side of the room initially and thus chased her to the other side of the room, she would need to pass through the killer to return to the side she had come from. It would make more sense to run into the box room than to try running through the killer to get to the door that leads to the hall.